BITMAIN "UAHF" - irrelevant. It's not getting much media attention and I doubt it'll have much economic support.
BIP 148 UASF - also
probably irrelevant. We're probably looking at a chain split with negligible hash rate that won't get far in terms of third party wallets, exchanges and merchants. However, you should still have your private keys safely under your control during that time. The main factor is whether SegWit 2x happens - if it doesn't, UASF could become at least moderately relevant.
SegWit 2x - yeah, I think SegWit will happen on there. The HF might end up with a lot of users and merchants following the miners and the agreement, so I can see a 2MB SegWit chain being dominant in the end. I'm not sure about this though.
no one, and i mean no one, wants chain splits. if it comes to the brink then enough people will see sense and make sure it doesn't happen.
If there is actually economic support, chain splits can be fine. But when the situation is more subjective and there hasn't been a fatal bug like the overspending problem in 2010, it does seem risky.