Favorite = depends on my mood, but Bonzini and Tornado are probably my favorites, mostly due to the fact that I play them more than the other tables, but I would put Fireball and Tecball right up there as well. I have probably have the least table time on the Garlando (probably why I considerit my least favorite)
Most of the ITSF Tables are pretty sturdy, well built, and will last a LONG time.
Warrior - plays great, very good ball, crap cabinet (not sturdy at all)
Bonzini - love this table, but the surface not being truly flat is the most annoying factor for me, well built, very sturdy
Fireball (the newest model) - plays great, very good ball, sturdy cabinet, THE BEST RODS I have ever seen!!!
Tornado - plays great, sturdy cabinet, truly round ball, I think the ball could be a LITTLE softer to allow for a wider variety of consistent shots
Euroscooer - plays great, sturdy cabinet, very good ball, men are not properly counterbalanced (but close), goalie rod is too close to the rear wall
Robertosport - goalie rod too close to the rear wall (rod will not rotate 360 degrees), cabinet not as sturdy as many of the others, plays pretty good
Tecball - sturdy cabinet, plays great, ball could be better, soft enough but they cannot seem to get rid of the seam and get them consistently round
Garlando - pretty sturdy cabinet, HUGE side strips, very fast play, decent ball
Shelti - good cabinet, good ball, great rods, feet on the figures are a little too wide for my liking, otherwise the table plays great
Having a good ball, and a sturdy cabinet, and a flat play surface seem to combine to make a pretty good table. All of these tables are pretty expensive (with the exception of Warrior and Fireball).