Gloomspite: probably got weaker with some changes and miss out on some changes by unfortunate things like keywords and wound counts, a lot of the stuff they got from WD where warscroll battalion that can't be use in match play anymore. i am not entirely fuss though since they generally had good enough warscroll on some units to keep trucking along, competitive play whatever everything get shaken up it doesn't really matter at the moment. i don't even expect FAQ or GHB to do anything worthwhile to any army, just wait for a new battletome
SON of BEHEMAT: straight upgrades everywhere, mainly because Sons didn't have much of anything to begin with but every new rule gives them more options and some of the new restriction don't affect or cause problem for the Gargants when playing them. new artifacts, monster abilities, heroic abilities, new CP abilities, Battalions all gives them improvements.
Bonereaper: i believe you can't stack CA on a single unit anymore which kind of sucks for OBR, their offensive power kind of fell a lot because of that, usually my go to combo was using the Leige CA ability with the Pertrifix elite Bludgeon ability with maybe a lucky soul guide and Empowered Naderite weapon to boost my offense enough to clear through enemies as well as a Shield wall to survive the oncoming attack. Mortek Crawler are probably going to be the way to Play OBR for a while