I had an OS 160 in a 13lb plane. It had unlimited vertical but was nothing to write home about.
I'm sure the moki 1.80 would give better vertical. If your main goal is 3-D power the 2.10 would be a better choice.

But you might want to consider gas, ZDZ has a new 50 on the way. There are also other good ones. I have the zdz40 in a 16lb plane and it will become a dot in the sky in short order. Plus the smaller gas engine are not that much heavier than the 2.10 and don't use near the fuel.

This is just my opinion.

Dave