Between the tube3, PTS, and the regular pf tracksuit, the regular pf tracksuit is still my favorite. Easy to fly and so nimble you can FF with it. You could probably pick one up used for relatively cheap and have a rigger install back fly vents. Or, you just back fly without the vents (which I did)
Only the tube4, cruise and masai give you backfly vents. If ease of handling and backfly vents are the deciding factors then this leaves only the tub4 because of the added volume reduction system.
As to the rumor mill and random thoughts part: I have heard only positive things about the cruise and masai. I don't know anything about the tube4. You have probably seen the incredible stuff the soulflyers are doing with the cruise. Jhonny florez is posting GR of 2:1 with the masai (yes yes uppers). I have a masai and Sumo on order. Saw a masai yesterday....its a hybrid between wingsuit and tracksuit. It really depends on what you hope to achieve. I think FF flocking with masai type minimal drag wingsuits could be a pretty fucking rad crossover discipline between wingsuiting and angle flying/flocking
If you have seen Andrey Karr's brento fly by in a tracksuit, that was done in a regular pf tracksuit with volume taken out of the pants.