Millennium is the most comfortable. Since comfort is obviously something you're concerned about, probably should look into one!
Given that he said he's b/t a Hawk and a LW and all you guys are steering him towards comfortable Milleniums; I'd say a Hawk Helium which is basically a lightweight Millennium for much cheaper.
If your greatest concern is comfort the above suggestions have you covered. If quietness, ease of setup, and mobility is important you may want to sacrifice comfortable.
So I don't have either of those, but the two inch thick seat on my XOP is surprisingly uncomfortable. I assume that the Lone Wolf seat is pretty much identical. I can sit on the cheap foam seat of my $30 stand from Menards longer than I can on the XOP. I would not want to carry the cheap stand in every time I wanted to hunt though.
My brother and I sat together in a two man Hawk this past weekend for the first time and we sat for 7 hours with total comfort. The leg room and chairs were the best I have ever experienced, tt definitely has me sold. I can't speak on the millennium behalf, but I heard they were good stands too.