Hm, Triumph is physically better, but Coldcast's attacks impress me more. Triumph can try and drain Coldcast's charge but that seems like it'd take time, and while he can can certainly absorb at least some of what CC can throw, CC has a much wider variety.
I'm really not sure. Triumph *might* be able to no-sell everything Coldcast throws, but there's also a high chance that something more esoteric like CC's biological EMP, redsunlight, or similar will get past.
I'll give it to Coldcast, but I with admit to finding him a better character which may bias me on the call between their powers.