I used both this past week in KS. Temps were at best 20's and down to ~11 deg and winds of up to 30 MPH. Overall, bloody unpleasant for ~14 hours in the stand! I also used a FL Sanctuary System.
I do tend to be on the cold side as an upfront warning!
My Feedback on the 3 systems:
I like the Fanatic design the best. I like the Kangaroo Pocket / Range Finder pocket setup etc ... Very well thought out and I also like that it lacks a hood! A detachable hood would be nice, but i'm OK without it as I end up with too darn many layers of hood from under garments + jacket. I also like being able to tuck the collar down inside the jacket on my draw hand side to ensure that nothing interferes with my bow anchor. I love how quiet the Fanatic material is! Downsides to the Fanatic (IMHO), I think it's best down to ~25 deg or so. Beyond that and it was more than just my extremities feeling chilled. You really need a good insulating layer underneath the Fanatic jacket as I found that by itself it was not as warm as I would have hoped given the bulkiness ... and yes it is a bit bulky IMHO.
The Incinerator is flat our warmer than the Fanatic without question. I could easily handle ~20 deg temps + strong wind without requiring a puffy underneath (unlike the Fanatic). Once it do down into the teens, I did add a lighter puffy underneath. It's not as quiet due to the lack of the Berber finish, but it was not an issue even when the wind was non exists and the woods were dead quiet. Less forgiving than the Fanatic noise wise, but not a real issue IMHO. Solid pocket design, albeit not quite as nifty as the Fanatic.
The FL Sanctuary is comparable to the Incinerator generally speaking. The jacket is a touch longer, the pocket design needs work (Again, my view). The hand slash pockets on the jacket have a cuff to keep cold air out, but the lining isn't attached so anything other than a slick/slippery light glove results in the liner wanting to come out with your hand. The pocket design also makes it touch to even find a bloody hand warmer inside as they can get caught up in the material / draw cords. There is also very little material / insulation on the exterior of the pocket. Meaning that when your hands are stuffed in their attempting to desperately keep fingers warm ... you'd better have something else between your hand and the outside of the jacket as the wind can make it through. NOTE: I was using a pair of FL Glassing Mitts (Lightweight down mitten (which are awesome!)) and wearing a FL Merino liner as I always like having a liner in between me and my bow/release. This combo worked pretty well, but slotting hands back into the mitten or a heaver gloves stuffed into the pockets was still non trivial for me. I did find that I needed the puffy under the Sanctuary jacket a bit sooner than the incinerator, but both are very good and IMHO both the Sanctuary and Incinerator feel less bulky than the Fanatic even though they are designed for colder weather.
IMHO ... DO NOT try and walk in wearing the jackets for any of the above unless your goal is to start sweaty and get cold! Wear something lighter and unzip the bibs a bit to allow for ventilation on the way in. I know some folks don't wear the bibs on the way in either and I understand why. My take is that carrying both the Jacket & Bibs to these systems + wearing in your other layers is a ton of crap to lug in and I compromised by wearing the bibs. I'm also looking to spend as little time as possible at the base of the tree and the thought of removing boots to put on bibs is less than desirable. Yes, it's true that the Bibs all can be put on w/o removing your boots, but I prefer my pant leg to be inside the boot (Lacrosse Alpha Burly Pro), which then means it's easier to step into the boot while wearing them.
I did struggle with cold hands, but like I said I'm a wimp in the cold. The Sanctuary system wasn't ideal for this, but adding the Sitka muff did the trick. With the Fanatic / Incinerator I see the Muff as a nice to have and not a must have.
I also big time struggled with cold toes. Wearing 1600 gr boots and tried various combos of a merino liner + Heavy FL Merino socks. My orthotics were part of my issue (due to a tendon injury from Elk season) as the top cover would absorb any sweat and then proceed to permeate my socks ... which leads to cold. I am considering if I should wear my pants over the boots as perhaps I am overheating ... just postulating to see what others have found.
My Summary ... I like all 3 systems. If I had to choose just one it would be the Incinerator.
My .02
