I can only offer my opinion on the X, as I have not owned a nemesis.
I own two clone X's, both by Infinite. I like the form factor, being short even in 18650 mode. Magnetic buttons, easily adjusted for battery rattle, throw can be adjusted, floating 510 pin. They both work great in Hybrid mode!
I like the clones so much, I purchased an authentic XTi to help support JDTech in their future development!
If possible, I'd suggest checking out a local B&M (if you have one around) and holding both in your hand. That might make the decision easier!