On the technical side, because both target to fix the BTC scaling issues, IOTA is not comparable:
- It has a centralized "transaction director" and it is not clear when and how it will be "decentralized" and what will be the consequence
- They claim that it can have instant transaction when it will have more user, but it is not the case currently
- They say that it can handle 1000, maybe 1500, but thats far from what XRB can reach:
https://i.imgur.com/oRpO8lc.gifXRB lack a good wallet, has a bad branding currently, is on no good exchange, but on the technical side, Its Blockchain technology is so far the best that exists.