Nexus will always have a special place in my heart. Setting up an actual infrastructure using cubesats and mining for prime numbers is pretty damn cool.

syscoin got me into crypto although I think bitbay may give them a run for their money
I think Sia or one of its competitors will be huge
Xby may be a hidden gem or stinking turd time will tell

Xel, walton and bat also seem pretty good

Lot of good coins out there