If I can choose an MMORPG, then it will probably be Runescape, as the game is really fun to play for me, I love the skills in the game and the same goes for the quests.

But for a Single-Player RPG experience I would probably choose Pokémon Mystery Dungeon: Explorers of Sky, I couold never get tired of that game, It's such a fun game experience, with the different combinations of the Starting Pokémon and the story is really enjoyable. I would not either mind chosing Final Fantasy X, really liked that game and really like it now. Was a very big fan of the ending.

MMO: EVE Online (because one must dedicate his or her life to enjoy such a game)
Single-player RPG: Xenoblade Chronicles (I could probably spend 500+ hours in that game if I really want to)

That is not the point. What is difference between Diablo Xenoblade and Pokémon?

Tales of Symphonia...best rpg ever imo.