Well i went from a 16v KR Jetta to a VR AAA Vento and you can feel the difference for sure. The torque is better the sound is great and it was so smooth. But a mate had a Mk2 ABF running 183bhp and it just ran rings round it, (in the Golf+ mag as the fastest NA 16v). The VR would drink fuel like it was going out of fashion (seen 8mpg on MFA, best ever was 30mpg) and if any think went wrong its big dollars to fix.
Now ive got a Mk1 running a 9A i dont think i would go back to a VR cos the power difference is not worth it.
I do miss the sound though something rotten but when the 16v is screaming it sends a tingle down your spine.
I would say stick with MK2 as i think its better than a VR.