I like both, but if it was my money I'd put it in Stratis at the moment. EOS is still in it's year long daily offering and is probably not going to really take off until only a couple months are left. Consider that there are 2 million coins being released everyday and that will continue for awhile. I like EOS and will be buying, but not until later down the road.
Stratis on the other hand doesn't have that kind of dilution and is proof of stake which means you'll earn additional stratis for staking your coins. It's a better bet to have good runs and pull backs as well, which makes it better for trading.
I'd recommend you take a look at NEO as well. It's been consolidating nicely now for a few weeks and will likely be shooting up again soon.
Good luck!
Thank you @raised2b, that is something to consider. I also like the Stratis collaboration with Microsoft. I do not own any NEO, but I'll look into it!