Personally I like tren. I get great results from 75mg. a day. Strength goes through the roof and the gains made are hard muscle. I get a lot of sides though and it kills my hairline.
For me, fina is great for strength and dense muscle, though not too much in the way of overall mass. Stacked with test or dbol though, then the mass and strength both pile on in a hurry... it's my 2nd favorite gear for strength
I like tren. Nice strength gains, sides are not too harsh for me @150mg/EOD, however, the EOD injections ARE A PAIN IN MY ASS!!!! Literally. I am sticking with long lasting esters from now on. May try tren enan in my next cycle.
Different results for different peeps, you still have to train like hell, eat a good diet and so on. Its popularity is its availability. I think way to many folks take a caviler approach to Fina. One should be seriously training before taking the step towards any gear. Good luck no matter what you choose.