I usually don't make it to 5 different slots at 3Dice. I only play about 4 different ones. I don't care for some of them. Medeival Moolah is money gone too fast unless you score early. The Squirrel game would be fine if it weren't for that bonus round, and I don't really like the 3-reel slots. So here's my short list:

Industria or Happy Valley first.
Fortune Falls
Tut (only if I get ahead first...or am in desperation mode)

Tut will either make or break you. Your credits will either shoot up like a rocket, or you go into a downward spiral straight to heck.

Happy Valley can go an amazing amount of spins without a bonus, but once it comes, don't go anywhere right away. They usually come close together and than disappear for a long time again, but the line hits aren't bad on that game because they can keep you alive sometimes during the dry spells.

Supersuits........ I have very little confidence when I play that game. It seems like the hardest slot for me to get a bonus on.