I think my thoughts are in line with most folks so far. I actually sold my AS8 a month or so ago simply due to the amazing appreciation it's seen over the past couple of years I owned it. While I like the cover, it doesn't really feel like a 1st appearance to me (given that the appearance/story was hastily added and was originally intended for Sen1 in the first place). Presumably AS8 will always be the bigger key and is indeed first appearance, but I wonder if the cost gap is a bit too wide right now between that and Sen1 and WW1.
Personally, I've always loved the Sen1 cover the best, so will keep my copy indefinitely. Certainly my personal favorite of the three.