I’ve bought pieces from First Lite, Meriwool, LL Bean, and Icebreaker.
Honestly, there appears to be only minuscule differences in quality/durability between most of these. With that said, my icebreaker has been the first to wear out, and feels thinner than the same weight/GSI in LL bean crestawool but I’ve owned/used/laundered the icebreaker longer/more than the others.
Of the ones listed here, the sizing is good on all of them for me except the LL Bean crestawool which ran short in the torso.
Comfort is subjective as well, but for me, First Lite is the clear winner in this category, but not by an astronomical margin. Worth the difference in price? Having it in a camo pattern is worth it for me, even though camo patterns are not necessary to kill deer.
Honestly, I have been very impressed with the Meriwool, and plan to buy more of there stuff. this would definitely be my “best budget” pick.
Ultimately if I were to rate my satisfaction among these, I would say:
FL>Meriwool>icebreaker>ll bean