The way to work this out is to multiply its Attack with the power of the physical move, and the Special Attack with the power of the special move and compare. This is not exactly what damage it will do but the damage will be proportional to that (the formula contains this calculation inside it).

Ice Punch = 75 x 174 = 13050

Ice Beam = 95 x 142 = 13490

So Ice Beam would be better in this case.