This is my personal list of favorite crossovers. I didn't put reasons because I was too lazy and maybe I'll edit it later but not now. And except for Ariel and Jim these aren't in any particular order. I love them all equally.
15. Jasmine/Tulio
14. Jenny/Penny
13. Jane/John Smith
12. Cinderella/Jim
11. Cinderella/Eric
10. Jasmine/Sinbad
9. Belle/Shang
8. Belle/Phoebus
7. Lottie/Eric
6. Pocahontas/Little Creek
5. Aurora/Lumiere
4. Peter Pan/Alice
3. Aladdin/Ariel
2. John Smith/Ariel
1. Jim/Ariel
<3
15. Jasmine/Tulio
By Diamela
14. Jenny/Penny
By Me
13. Jane/John Smith
By MegaraRider
12. Cinderella/Jim
By kanjo-girl (Deviantart)
11. Cinderella/Eric
By Ribon95
10. Jasmine/Sinbad
By Chesire
9. Belle/Shang
By Chesire
8. Belle/Phoebus
By Bugbyte98
7. Lottie/Eric
By Me
6. Pocahontas/Little Creek
By Chesire
5. Aurora/Lumiere
By Me (One of my first crossovers so his head's a bit bigg)
4. Peter Pan/Alice
By Someone
3. Aladdin/Ariel
By Jranaa
2. John Smith/Ariel
By Me
1. Jim/Ariel
By Someone
<3
