Thread:TheDigger1/@comment-26829669-20151129112627/@comment-26220697-20151129204049

Well, his strongest mech, Super Tengen Toppa Gurren Lagann, is 52.8 billions light years tall. The universe's size, as far as we know, is around 46 billion light years tall. Simon's strongest robot is literally bigger than the known universe. Also, its strongest attack the Super Tengen Toppa Giga Drill Break, forms a drill at least ten times bigger than that before ramming the opponent with it.

While Superman does have unlimited potential due to gaining power from the Sun, Simon's Spiral Energy grows infinitely as well. The more determined he gets, the stronger his Spiral Power becomes. Basically, Simon's power is also unlimited, but it grows at a much faster rate, to the point where his power is enough to create a galaxy. He was able to defeat the Anti-Spiral, a godlike being that can fire blasts with power comparable to the Big Bang, without using any of his mechs.

I'm more familiar with Simon than Superman, so I could be wrong, but I think Simon wins.