Both
I am usually focusing on one variant at a time, and at the moment it's ZOOM.
With ZOOM I'd play 1 or 2 tables. It's fast and pretty much ABC. Some sessions can be a little easier to steal so I loosen up a bit but mostly TAG and keep and eye out for weak spots.
Eventually, I need a change (I switch about once a month) and focus on standard cash tables. With standard cash think it is a bit more 'POKER' than zoom, so the games are more varied player dependant, I try to play an appropriate style to gain the most profit. (I play 4 cash tables at once)
I've found switching between the two has helped me improve in both variations.