I am wondering how this compares to the Stoic Event and if an XL is going to fit me 1t 5'11 200lbs 36 waist

Will the XL fit..yes, the L will fit too. Depends on how much you want to layer. Long story short, go for the large.

My notes: XL weight 500 grams.

I bought both the eVent and the superfly along with a bunch of other jackets, so I can give you some short-term insight. I didn't have a chance to do any field tests, but rather just detailed inspections of them both. Material: Super-fly seems to use more durable face fabric. The face fabric is the same throughout the entire jacket. The stoic uses thinner face fabric below the shoulders, and thicker/burly fabric on the shoulders. The burly fabric on the shoulders of the Stoic seem to me to be marginally more durable than the Superfly not because it is thicker (in fact it feels thinner), but because the weave of the material seems to be tighter. Of course both use eVent so performance will be generally pretty good based on reading a ton of reviews/comments. (Again, I did not field test this) Design: I like the Superfly fit/design more than the Stoic. The cut of the Superfly conforms to a more natural body shape. In comparison, the stoic is more of the ideal athletic cut (inverted triangle). I fit a M in the Montane, but needed a L in the stoic just because it was so narrow around the waist (again due to inverted triangle shape). The design of the superfly also excels in the hood. It can fit a helmet comfortably and also I found that the cinches were designed so that you could operate it easily. Another design aspect that the superfly is better at are the hand pockets. The pockets of the SF are located at the chest level so as to allow easy access when wearing a backpack with waist straps. On the other hand, the stoic has hand pockets by the waist, making those pockets useless if you have your waist straps secured. So based on these two categories (material and design), I feel that the Montane Superfly is a superior jacket than that of the Stoic. However, there are been some cases where people have found that after a few seasons/years the superfly showed obvious wear-tear near high abrasion areas (such as shoulders and waist). I am certain that the same is true for the stoic since it uses even thinner material. One person who reviewed the stoic also made that comment about "small rips". Maybe, the reason why no one seems to complain about the stoic might be because it has not been on the market as long as the Superfly. Also, maybe the clientele for the stoic is more geared towards skiers than backpackers who wear lighter packs. PS - In the end, I have an Arcteryx Alpha SV. Although I love how eVent promises superior breathability on paper and on field tests, I really liked the design of the Alpha (imo better than the superfly, and significantly better than the stoic) and the durability of the face fabric. I'm crossing my fingers that Gore-Tex Pro will not be a total flop. I hope this helps. If so, give me the thumbs up.