So there's MAID and Storj which are the two front runners right now it seems, SIA is another contender but I haven't seen much from them recently. Ethereum is supposed to at some point have on-chain storage but it hasn't been as much of a priority as the other parts have been.

Just like most software, we'll pretty much have to wait and see which one takes up widespread adoption and is actively developed. Right now they're all in their infancy.