Thanos vs Thanos

Doppleganger from Infinity was with a Cosmic cube vs Regular Thanos w/ reality&power gem

In theory the PG and RG are enough to build the IG

the reality gem has no feats, but i guess all it's used for is to allow certain feats to happen even though the universe says it shouldn't, like say thanos creating a population of a billion beings in an instant from seemingly nothing but will.

Yeah I mean going by their description

I'd see as a regular cosmic cube as being superior to RG alone but amped with the PG i'll give it to the RG,PG thanos

Thanos with Gems FTW.

Cosmic cube alternate reality and so does Reality Gem. Best the cube can do is stalemate it.

Reality gem can backfire on the user though, which i've never seen a cube do.