Okay, for me, it's:

1. Shang
2. The Prince
3. Aladdin
4. John
5. Naveen
6. Beast
7. Phillip
8. Charming
9. Flynn

1.Flynn
2.Shang
3.Aladdin
4.Prince
5.Beast
6.Phillip
7.John Smith
8.Charming
9.Naveen

1.Aladdin 2.Eric 3.john 4.charming 5.beast.6.philip

1. Prince
2. Shang
3. Charming
4. Aladdin
5. Phillip
6. Beast
7. John Smith
8. Naveen
9. Flynn

Comments:

Shang - already in the other pick.
Prince - Prince is so underrated, but if there is one area where he deserves recognition the most, it is his voice. My GOD, his voice is so beautiful. It is so rich and expressive, yet has a lot of power to it. It is not weak, breathy or poppy; no one sings like Prince does anymore. I swear, every time I hear the "One Song Reprise", I start tearing up because of how beautiful Harry Stockwell's voice is. In short, his voice is like angels descending down from heaven.
Charming - this guy is also so underrated, and MAN, can he sing! His voice blends in beautifully with Cinderella's. I find it so ridiculous how early he left...tut tut, for shame!
Aladdin - already commented in the other pick
Phillip - his voice is nice, don't get me wrong, but his voice is kind of generic compared to the other princes. There's nothing unique that stands out about it.
Beast - his voice is good, but I wish I can hear more of it. The reason why it is so low for everyone is because he hardly sings at all (which is kind of fucked up in my opinion, because Phillip sings just as long, doesn't he?! How the hell does Phillip get such a high rank when he only sings two lines of a song?!). But his voice is nice. It's not the best, but it is good.
John Smith - his voice is not bad, but Mel Gibson sounds better talking than singing. I appreciate it for what it is though; it does not make me cringe like others. XD
Naveen - his voice is not bad either. I don't understand what KataraLover has against it, anyway; I made him listen to it, and he says it is my fault for "making his ears bleed". LOL But, I give props to how unique the tone is, with its jazzy and blusey feel. None of the other princes have that, and this is what sets him apart. However, I just like the other voices more. That's why it is so low on my list.
Flynn - he has the worst voice put of all of them. He is so poppy and sounds like one of the Jonas Brothers. Every time I hear him, I want to turn him on mute until he finishes singing. His voice does NOT give me chills like my higher ranked ones, there is nothing unique about it...he just sounds SO much better speaking.

1.Shang
2.Aladdin
3. Prince
4. John
5. Naveen
6. Charming
7. Beast
8. Phillip
9. Flynn

1.Prince
2.Shang
3.Charming
4.Neeven
5.Aladdin
6.Phillip
7.John Smith
8.Beast
9.Flynn

1- Beast
2- Prince
3- Phillip
4- Charming
5- Aladdin
6- Flynn
7- Shang
8- Naveen
9- John Smith

1. Phillip
2. Shang
3. Prince
4. Aladdin
5. John Smith
6. Beast
7. Charming
8. Naveen
9. Flynn

1.Beast
2.Aladdin
3.Shang
4.John Smith
5.Phillip
6.Naveen
7.Prince
8.Charming
9.Flynn

@cromulanfav-, did you realize our lists are almost identical?

1.Aladdin
2.Flynn
3.Shang
4.Prince
5.Charming
6.John Smith
7.Phillip
8.Beast
9.Naveen

Lmao...I love the no icon...making up my list now...will post it in a sec :)

1. Shang
2. The Prince
3. Aladdin
4. John Smith
5. Phillip
6. Naveen
7. Prince Charming
8. Flynn
9. The Beast 

This is my list.

1) Flynn
2) Shang
3) Aladdin
4) Phillip
5) Prince
6) Naveen
7) Smith
8) Beast
9) Charming

(I had my doubts between Smith and Beast).

1. Flynn
2. Aladdin
3. The Beast
4. Shang
5. Naveen
6. Prince Charming
7. Philip
8. The Prince
9. John Smith

1)The Prince
2)Aladdin
3)Philip
4)Shang
5)Naveen
6)Flynn
7)The Beast
8)John Smith
9)Charming

1. Shang
2. Prince
3. Phillip
4. John Smith
5. Charming
6. Flynn
7. Aladdin
8. Beast
9. Naveen

Ok so this was incredibly hard
1. Shang
2. Aladdin
3. Flynn
4. John
5. Charming
6. Phillip
7. Prince
8. Beast
9. Naveen

1.John Smith
2.Aladdin
3.Shang
4.Flynn
5.Charming
6.Naveen
7.the Beast
8.the Prince
9.Phillip

@princesslullaby lol no, I pretty much sorted my three favorite and my three least favorite and randomly put the rest in the middle

1. Aladdin
2. Shang
3. Flynn
4. Naveen
5. Phillip
6. John
7. Charming
8. Beast
9. Prince

are you going to do an artcile for this?

1-shang
2-aladdin
3-naveen
4-flynn
5-prince
6-john smith
7-beast
8-philip
9-charming

I know my list kind switched around a bit so here's an upeate:I'm just gonna note that these are the voices I like best compare favorite princes I like best because that list is different compare to this one:
1.Flynn Rider/ Eugene Fitzherbert
2.Naveen
3.John Smith
4.Aladdin
5.Eric
6.Shang
7.Beast/Adam
8.Phillip
9.Charming
10.Prince

I'm not gonna do it. My opinio it's related to the italian version princes voice. So I really can't.

1. Shang
2. Phillip
3. Prince
4. Aladdin
5. John Smith
6. Beast
7. Charming
8. Flynn
9. Naveen

Hmmm something like this:

1. Flynn
2. Phillip
3. Snang
4. Beast
5. Charming
6. John
7. Naveen
8. Aladdin
9. Prince


6-9 might be reordered.

----stopping point 1----

1. Shang (I remember literally being amazed at his singing!)
2. Phillip (VERY close second! Tenors...♥)
3. The Prince ("One sooong..." ♥)
4. Prince Charming (Great harmonies with Cinderella!)
5. John (Very handsome-sounding and loving voice.)
6. Naveen (Not bad at all! And his accent goes well with the song.)
7. Beast (O...kay. O_o)
8. Aladdin (Nasal, breathy, tries too hard to put emotion into it.)
9. Flynn (Poppy, breathy, sounds like a teen. NOT pleasant.)

1. Shang
2. Aladdin
3. Flynn
4. Naveen
5. Prince Phillip
6. John Smith
7. Beast
8. Charming
9. The Prince