This isn't a matter of price, but what you want.
For overall brightness, they are about the same. The Fenix might be a tiny bit brighter, but definitely not visibly.
For throw, it's the MA6. Not even close. But the TK10 does have a decent amount of throw.
For UI, the Fenix is simpler and can be set while off. The MA6's multimode switch is satisfactory - while it cannot be set while off, you can set which mode it comes on in. It also has more modes, if you prefer that. They both come with tactical switches, useable on both of the TK10's levels but only high for the MA6.
Build quality is near perfect on both lights. Tiablo has usually been a bit flimsy, but they got it just right on the MA6. However, the TK10 is much more robust, with thicker walls etc.
TK10 has a smoother beam pattern. They both have very useful spill. TK10 is more efficient, but the MA6's efficiency is definitely not a problem.
I own a Tiablo MA6, and could not be more satisfied for a compact (er than a DBS) thrower. I plan to purchase a TK10 some time in the future as an all-purpose light. Most of the traits balance out, so its for you to decide: to throw or not to throw?