Do it ! I'm just finishing the base
TBF Final Fantasy is sub only. All is well if you purchase the ESO sub. The only issue is the lackluster expansions but they're also half the price of WOW Classic TBC Gold FF expansions and released twice as often. When you can double the size of these at the same cost, it's pretty competetive.
FFXIV also has a critically acclaimed expansion that is called Shadowbringers that has been hailed as one of the top Final Fantasy stories of the past 15 years or so. This is the highest praise I've ever heard about an ESO story.
Do it ! I'm just finishing the base , and I enjoyed each and every moment of it. I don't feel pressured to buy WOW TBC Gold hurry because Ilevel sync makes it difficult to finish old content. The the fact that there's other things to do other than killing it hoboing up, such as racing chocobo which is wonderful. My acquaintances who have played the dungeons with me won't give up on a wipe, and they will happily assist you whenever you need it.