If I were to choose between the 2, I would edge slightly in favour of the IlluminaTi. Both are good lights.
What I like about the Maratac is the price, it's cheaper than the IlluminaTi and lighter weight because its Aluminium.
Twisting wise, I find them both similar. The Maratac may be easier to twist, because it's aluminium and has anodised thread however the IlluminaTi is fairly easy to twist too. I could turn mine with one hand.
Knurling - I find the IlluminaTi has better knurling than the Maratac. It feels less sharp and abrasive. The square flat knurling on the IlluminaTi is the best for keychain imho.
Output - I prefer L-M-H, rather than M-L-H, but that's really a matter of opinion i think and depends on your personal preference and usage.
Led emitter - The IlluminaTi has a perfectly centred emitter, whereas the Maratac can have a slightly offset emitter. The reason is that the IlluminaTi has a centering device similar to what the Quarks have. This basically makes it impossible to offset the Led emitter when it's installed.
Attachment point - both attachment point allow tailstand, which was one of the reason i purchased these lights too. But also their weakness too. If you look at the ITP versions, there is a nub with a hole in the center which makes it pretty solid. I don't really like the metal spring wire used as the attachment point for the Maratac, it's a bit wobbly, and doesn't feel very solid.
I think the IlluminaTi has a better design with the hole drilled into the body of the flashlight. However one big potential issue with the IlluminaTi attachment point is the thickness of the attachement point. It's very thin. It's no thicker than the human hair and my attachment point is showing signs of bending. It seems to be prevalent on most of the IlluminaTi, and appears to be part of the design. I think they should make the attachment point deeper, at least 3 mm deep would be minimum. This should strengthen the light alot.
The Maratac attachment therefore is currently better than the IlluminaTi, however it's possible for IlluminaTi to improve this in future batches.
Overall the IlluminaTi would be my preferred choice. I'm hoping for IlluminaTi to make changes to the attachment point, then I think it will be perfect.