TWF: 18/2 fgt/rog Kensei 3 v.s. 12/6/2 fgt/rng/rog

[metalworker]

Not too experienced with TWF builds so here's a question for the more experienced players.

18/2 Kensei 3 has evasion, UMD, more feats, and Kensei 3 (extended crit range)
12/6/2 fgt/rng/rog has evasion, UMD, 10% alacrity, rng enhancements
12/6/2 fgt/rng/mnk has evasion, 10% alacrity, 2 more feats

Disregarding analysis to AC, which of the above build has in general more dps? I'm not familiar with TWF, whether the 10% alacrity will outdps the Kensei 3 extended crit range. I'm assuming the 12/6/2monk is more tough with 2 more feats but rog would seem to deal more dps with sneaks.

Overall, I'm looking for a build with UMD, evasion, and dps, so it's a choice with 1) or 2). I'm not sure which one would do more dps, so any advice would be appreciated. In particular, I'm seeking a stun-specced TWF build that is more applicable to epics. I'm thinking 18/2 is a stronger build based on more feats, more to-hit and stun DC, as well as higher base HP (and maybe BAB?).

[Consumer]

The 12/6/2 F/Ra/Ro is the one to go for out of the three.

Would be easier to forget evasion and go pure fighter though.

[Khellendros13]

I have a 18/2 Fighter/Rogue Elf (originally Scimitars, but with a good stun, I switched to Khopesh and will TR into Human).

I went with 18 fighter mainly because I love the extra crit range (on all weapons actually, bugged) and so many feats. You can load up on toughness feats and still keep Stunning Blow (like my gf did with her pure fighter Elf, 610hp for an Elf THF...) or spec for a good To-hit and stun (OTWF, Stunning blow) which help in Epics.

I do miss the fighter capstone, but Evasion + UMD rocks. Plus, too many 12/6/2 builds around