To be honest my favorates probably arn't technicaly the best games on the system:
Gorf, Omega Race (play it with paddles), Radar Rat Race, Arcadia (although it's a bit solid), and The Perls of Willy, oh and not forgetting Mole Attack
My 'best games on the VIC' list wouldn't be the same as my 'favorates' list.
I would say: Jet Pack, Perils of Willy, Matrix, LazerZone, jelly monsters, Chariot Race, and Villan are technicaly amongst the best.
I think Star Battle was the most fun Space Invaders type game, although Alien Blits was probably the best/closest/most accomplished version for the VIC.
I'm still a bit of a VIC fan...