I only use Fur Affinity, Weasyl, and deviantArt. I also just set up a Tumblr/Twitter as well, I'll see how that goes after I finish posting all of my old art there.
DeviantArt isn't so bad, but it really only caters to premium users. I've just started to post there again after leaving it dormant for a couple years. The good thing about it being so big is I do at least get a lot more comments and attention there, but at the same time, it's also easy for smaller artists to get overlooked completely.
I want to like Weasyl, but opposite to dA, the community there is still a little too small and inactive, but at least it's easier to get noticed. It is overrun by furries, though.
Honestly, I don't think it would hurt to just try and post your stuff to as many places as you can. The only thing you have to lose is your time, and more exposure is always a good thing. You could always delete an account if a site isn't working out for you.