As long as you stay away from Limsa (all the crazy people meet there) Ragnarok is great.

The community is big, has everything from German, French to Russians and the people who speak numbers... Arabas. (I am Czech ftw)

And it also being a legacy server makes it the choice that stands out from the other servers.

The market is usually filled with stuff, so almost everything (except some rare items) can be bought there. The crafters are spamming PF so the rest should be easy to get there, many, many, players are crafting here so it should not be a problem to find someone who can do all the items you could ever want.

Just don't expect to buy a house, big population means it's bloodbath to get one even with the new wards.

Party Finder is actively... shitty. ^^ There are groups to farm extreme primals, Nidhogg Ex so far has all the stages of training in it, even some savage can be done in PF - clearing the content not guaranteed. As it is on most servers there are many players seeking carry, skipping training and overall ruining groups 24/7, tho I do not expect you can get away from this.

RP wise, there is not much RP going. There are some RP players but the population is not big, tho I saw some of them yeterday in Gridania (much better place than Limsa). Good luck with your choice.