I have a steel C channel 10.625" X 3.25 X .25" thick, I want to swap it out with a 6061-T6 aluminum C channel that will be just as strong or a little stronger.

Which option would be comparable in strength?
10 X 4.25 X .310 (AA)
10 X 2.88 X .526(AS)
12 X 4 X .290(AA)
12 X 3 X .300(AS)
12 X 3.17 X .510(AS)