CGBytes and Renderotica are the same as far as I know. Never thought of them as different stores. While it is true that Renderotica has a lot of crap, that is kind of true for all stores imho. Renderotica has the best genitals though, and some kinky stuff you won't find elsewhere. Good PA's that are only on Renderotica: Meipe, DB XXX, Laudanum, LEONDigital, 3feetwolf (which for some reason has his old genitals under 3feetwolf_legacy now)
I don't really agree that Renderosity has better clothing then Daz, in fact after all those PAs have migrated from Renderosity to Daz, a lot of the good clothing assets are now available on Daz. Lilflame, Rhiannon, Devianttuna13, Dzheng, Vicey3D, fefecoolyellow, Maddelirium are some that I like that are now on Daz. Plenty of others migrated as well. Some of those that migrated still have new assets on rendo though, I think all of the ones I mentioned have at least some of their assets on rendo still.
Some noteable PAs that are still exclusive to rendo that I like: RainbowLight, Man7a, zoro_d (semi-exclusive), Kadaj777, exnem, romarovprivate, curtisdway
Yeah, Renderhub is pricey, because they don't have sales like the others (Renderotica has also few sales with high discounts), but you can find good Daz stuff there.
Dexon3D (really good), ugarman (pretty unique toon look), squarepeg3d (check his patreon), InTheFlesh (free Dev kits for G8 and G9), SOFT3D (maybe), XR71 (maybe) and so on and so forth. Bigger problem with renderhub is that you have a relatively high risk of buying stuff that where the seller actually doesn't own the IP and just ripped it out of a game or something like that. And then you can't really use it, well, you can, but the you have the risk of getting sued because you're violating someone elses IP. Like ROMFX or guhzcoituz for example, which has most of hist stuff marked as IP restricted now that I've checked, but I think this wasn't always the case. Either way, just gotta be aware that "IP restricted" means you risk getting sued if you use the asset in a game.
There is also CGTrader there is some stuff there, and they sometimes even have good sales, but for Daz stuff I rarely look there, some of the PAs on Renderhub also sell/sold there, like Tri-X, who is pretty much in all stores now.
Pricewise I think nothing beats Daz sales, those guys are ruthless when it comes to selling. You'll buying something at 90% off and regret it the next day cause it is now 97% off. I live in constant fear they'll do a sale like "Fuck it, 100% off everything for a day". I'd probably get a heart attack.
EDIT: Actually, some of those that I thought were exclusive on Renderotica and Renderosity are also on Renderhub, Kadaj777 and DB XXX for example.