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GTA3 would be my choice, just too much to do and definitely the best game in my collection....so far!
The only POSSIBLE way of judging them is the longevity of the games, and the chances of you returning to play the game after a good period of months.
For me, GTA3 has the edge in longevity, short term. Sounds a bit of a compromise, but you can play this game for months and months on end. But then, SSX Tricky is ALWAYS fun to play, even after a year. Maybe with GTA3 it'll become boring after 6 months, and then you won't play it too frequently.
It's a tough decision, but i'd probably say go with GTA3 because of the sheer magnificence of it.
Both are top games.
MM