It's not a simple as that. It depend mainly on YOU and what YOU need and like. Each has their advantages. We were all surprised to learn, for example, that typical "ugly" round AG pools tend to get used more than fancy IG pools. Why? BECAUSE they are so darn ugly, nobody keeps them around if they aren't making good use of them. "House Beautiful" doesn't ooh and ah over your 30' round, so, better make good use of it. And so, people do.

Are you lappers or dunkers? Do you need length for lapping or not Lapping means 40 or 12 meteres, minimum. Is your terrain level or sloped?
Is this for parties or just for play, like personal play?

Just a start,

Carl