I pretty much shitpost on all of them as there's no longer room to communicate. Except on /a/ maybe and /ic/ eventually.
/b/ is mostly for the gore stuff and the loli threads, and for the unexpected gems threads too.
both /w/ and /wg/ are pretty much where I get my wallpapers.
/his/ is pretty much compromised with redditers from communist subreddits spamming the hell out of the board.
/ic/ is good if you like drawing and art, people aren't toxics there.
/g/ is dead and I only use it to show off my desktop or get inspired for new ones.
/jp/ is dead.
/pol/ is compromised by trannies, CIA and other redditers. It's not the same as it used to be.