I'm not playing it at the moment but the most recent one i was actively subscribed to was ffxi. I find that now when I want to pay an MMO I stray away from the wow likes (if i want that style it's xiv for me though). I like the older ones that use more archaic combat systems because they're often very unique on a genre where everything now feels very similar.
Also here's an obligatory "I miss Wildstar"