Both are really nice, ETH got pumped hard and have some congestion but in the same time it's the most used guys!
And NEO, awesome project and scale incoming.
Hard question, if i can choose only one I will say that if you are a developer who want to learn just go to Ethereum, and if you looking for investing just pick NEO (At the moment).

Join the Kucoin Exchange and get the christmas reward!

yeah its seems like these two are the future of crypto and thanks for the comments, i followed you!