This in only my opinion
Traditional Turnbased RPG (eg Final fantasy series, Dragon quest series)
Pros: Menu base, easy to learn, usually has epic stories, lots of unlockables,sidequests. large worlds
Cons: Gets repetitive, mostly lacks character exclusives (you know, characters can be easily replace, sorry for bad explanation ) usually battle takes too long, and the most famous, ENORMOUS random encounters back in the days, still use today, for hardcore gamers. and requires too much grinding.
Strategy RPG (eg Final Fantasy tactics, Disgaea, Advance Wars)
Pros: Easy to learn but hard to master, some has great storylines, gives challenges to the player bec it requires strategies, Usually has wide customizations of characters/units.
Cons: Sometime too hard and requires to much grinding with one battle takes to long to finish. some has epic-fail stories,
Action RPG (Tales of series, The world ends with you)
Pros: Battle system is so fun, usually not just button smashing, not-always to make some grinding, has good to epic stories. ARPG's battles are not always in Random
Cons: Sometime gets repetitive.