Hey guys - there is nothing wrong with a round pool. Also, I think structurally they are stronger than an oval because the water pressure is exerted equally on all parts of the pool wall. Thus, no need for buttresses which in my opinion, don't look very good in your yard, and are a pain to mow around.

BTW - You know you're gonna get multiple answers to this question. It's generally gonna be whatever people have is what they are gonna recommend. Kind of like the "what is the better type of filter - de, sand, cartridge - debate!"