Smart contracting platforms are hard to call. Generally, I'd go for specific use cases that you can wrap your head around. In particular, I would concentrate on decentralized exchanges. messaging and invoicing. I am staying clear of reward projects; no clear winner.
IoT is interesting but not for monetary store-of-value (imo, IOTA is not a safe store of high value). Walton is interesting, but I have reservations because parts will remain closed source.
In 2018, Bitcoin Cash will surpass bitcoin and dash will safely clear $10,000, riding on the back of it's sister Bitcoin Cash. DigiByte (another big blocker) is an outlier but might also go 10x.