ARK
Why?
Because the team of developers are insanely productive, and actually get's things done. They never dissapoint, and I actually believe they COULD outperform Ethereum long term.
The reasoning for that is the community behind, which has been growing at such a crazy rate that the subreddit alone was one of the subreddits with the most growth on all of Reddit percentage wise a few weeks ago.
Also, Smart bridging block chains togehter is HUGE, let alone the smart contracts the Ark team will make on their own coin, which basically is what ethereum got so popular for.
Ark is going to be superior, Dpos staking is revolutionary too, and while ethereum does transform to POS, the rewards are not as high compared to ARK. ARK gains you about 10% yearly.
Yes, I DO hold ARK, and I know it sounds like I'm shilling the fuck out of it. BUT if you actually do some RESEARCH, and read the whitepaper which is HUGE, you will understand my reasoning. I'm also getting the ARK mastercard once they release it. No need for TenX or Monaco... Ark has it all, everything I need.
I do have other holdings as well. Don't get me wrong, but Ark has the most potential here, no doubt.