I have only ridden the Substance out of those boards and I absoultely love it. I just bought a Transcend myself, havent ridden it yet. Ive heard nothing but good things about the Abs Plat.
I've only ridden the substance and I love it. I ride it without the center fin.
I think the substance and the absolute would ride very much the same (or so I've heard), the absolute being a little more loose with the fin out, but landing softer.
I have also ridden the subjekt, and I did not like it at all. Good pop but much harder to ride than the Substance. The Substance is just a fun board.
I don't think you can go wrong with either the Substance or the Absolute.
most shops offer a satisfaction gaurantee, meaning if you buy a board, and you dont like it, you can bring it back and exchange for another one, so long as you take care of the board, no scratches, dings, keep it clean.
I rode a subjekt this weekend and it is fun, but really different. It is very loose and I had a hard time setting the heelside edge. Once it's on edge though it really bites in hard. It's fun...just really different. Not sure I'd buy one myself.