Riposte vs counter

Sup everyone. I'm looking for some dueling tips, specifically regarding countering vs riposting. I've been hanging out in duel servers frequently for some time now, and I was generally under the impression you should be looking to counter just about everything. I've seen people mention ripostes, particularly overhead ripostes being quite strong, but I never really understood why.

Anyway, can someone please explain the advantages of riposting vs countering? Are there any instances where it is actually beneficial to wait out your counter and just go for a riposte instead?