Question for TGP people - Which is better, constantly updated or updated once per day
 

Do surfers like to see the same thumbs / galleries throughout the day which get updated nightly or do they tend to like TGPS which update the galleries every 5 minutes or so?

Depends.
Try different methods out as each TGPs traffic is different. Personally, I used a 20min update query in Comus and it seemed to work well.

I can't tell you why, but it seems that bookmarkers like the one update a day better.
Ofcourse there are lots of TGP's which do very well with constant updates.