I've owned both. I enjoyed both. But if we're saying "better" game as in which one you enjoy
playing the most of the 2, I'm going with..............
BERZERK
Robotron has great sound effects, and the idea is cool, but I thought I was going to have a stroke every time I played it- you never know where you're going to be dropped in the screen, that hiccupy-heartbeat sound effect gives you the willies, and by the time you realize
where your player is, you're getting sandwiched by robots.. And that's in like the first 3 or 4 screens!!!
Berzerk on the other hand, you have half a chance from the get-go. More often than in Robotron, you know WHERE you are when the gameplay starts in Berzerk. You're not scampering around like Ray Charles looking for his Diet Pepsi (you got the right one bay bay).
Now, if you're asking which game is "better" as far as knowing it will TURN ON WHEN YOU HIT THE SWITCH, Berzerk wins once again.......
EDIT: oh crap and I almost forgot- if you mean which one's better because it TALKS???? Eremehhhhh... yes sports fans,
BERZERK!!!