Well, for starters Bitcoin Cash is complete garbage centered around a group of people who range from just plain bad to delusional. It's a complete non-starter for anyone who knows who is who and what is what in the crypto world.

Ethereum is somewhat interesting, but I have no idea how it can possibly scale at all. Maybe something has changed that I'm not aware of, but last time I looked at the numbers it looked pretty bad on the scaling front.

Bitcoin is just Bitcoin. It's the gold standard. It works, and thankfully has a bunch of superstar devs in the community who actually seem to have some pretty reasonable ethics and such.