I have a lawman, a voyager, an hold out iii and a voyager xl in aus 8 and a recon 1, 2 lawman, a mini recon, an ultimate hunter in xhp.
I love both steels, but for a comparison:
-Edge retention, xhp wins
-Stain resistance, xhp wins
-Strenght, probably around the same as I personally broke both steels on cold steel knives.
-Edge stability, i'd say that I could bring my lawman in aus 8 to a finer angle without chipping, but it may only be the ht on those specific knives
-ease of sharpenning, xhp isn't that rough, but oh boy that aus 8 loves to get a screaming edge! A few passes on the strop and it's done. I find that xhp sharpens about as easily as s35vn, so it's easier than s30v, but not by much.
-polishability, damn, if you are like me, a shaving sharp edge is only the minimum, but you like mirrors edge... Aus 8 was a dream to polish, but I find xhp a lot harder to get a mirror edge than aus 8... Ans I must say that it's also harder than mamy other "super steel" to get that mirror effect on xhp. I guess it's because the carbides are too big.
-Toughness, this really depends on the hardness and the heat treat... I 've seen some xhp from cs at 60 and other tested at 63, so i guess that the more it's hard the more brittle it will get. But from my own experience, both steels aren't prone to chipping, so I really wouldn't get stressed by this aspect. The only thing that I noticed is that my lawman in xhp tend to get micro chipping on the spined when I use the spine as a stryker for my magnesium rod. I start fires often so it's important for me, but I really understand that it's not a concern for most of you guys. My aus 8 lawman nevers chipped on me when stricking the rod.
Hope that helps as a comparison. For kitchen knives and light edc i prefer aus 8, but for bigger tasks or prolonged outings I always choose xhp.