Very difficult to have one supreme favorite.Kawamori San has designed and engineered some real beauties over the decades..
As of now, it would be the VF-19 Advance. I love it with the modern fast packs. It's a very dynamic design with a rich history and legacy ..Plus(no pun intended ) It's ace jockey is my favorite pilot
Close second is the VF-4. What a unique and well engineered design!
Tied for third, the YF/VF 21 is completely awesome, as well as the VF-25..
But i must also mention the VF-27 and YF-29's, and the VF-171, and SV-51..
The VF-1 and 0 will always be nostalgic..but you see what i mean? So many awesome VF's to love!