On One Pompino owners...

Reach is more important.

Timmy, measure your current frame effective TT, if it's a touch too long, go for one size smaller, too small, one size bigger.

Don't know about more important. Reach definately needs to be right but you don't want to end up with a really low top tube and have to use a stupid high seatpost and a fugly stem/bar setup to get your position right. ;)