If Al actually used ALL his powers (like under the pen of thomas) he would win. When he uses his molecular density manip he beats ga WW, MMH, AND OTHER powerhouses above Piotre.
Under any other writer he's usually portrayed as only using some of his powers. (Growth, strength, mass control), so he would loose.
I dont think so. His best strength feat is around 70/80 tons. Nothing Colosus couldnt match I would think. He has a couple of instances of better striking feats due to his mass manipulation like punching BA through a sky light. The thing is one you've seen him use the trick it seems its easily acounted for. When BA came to him before Black reign he acknowledged noticing that Al haf alyered his mass ready to strike. in JLA he was also noted by a villain to be a mass manipulator as he was doing it. This might allow him to get in a heymacker the start of a fight before Colosus is aware of the calability but not for a majority win.