First point is safety. Sea is very very large, so it is difficult for lifeguard to watch. And sometimes there are jellyfish in sea. I have gotten stung by a jellyfish once. It was really painful!! Pool is no creatures such a jellyfish and shark, and there is a limit the bottom. So, pool is superior.
But, sea has beach houses. They are very popular especially for young people. People visit beach house to eat or rest. It has a lot of delicious food. People love it. Eating outside is so good! Of cource pool has eating spot, but it cannot match.
However, not everybody can go to sea. Japan is island country, but some prefectures don't face on sea. And usually sea is away from people living. So, sea is more difficult to go than pool. Probably, pool is located where we can go easily.
Which do you like? This or that, I like sea because it has a sense of space peculiar to nature. I think it cannot feel at pool. So I recommend you sea if you hesitate which place you go.
However, not everybody can go to sea. Japan is island country, but some prefectures don't face on sea. And usually sea is away from people living. So, sea is more difficult to go than pool. Probably, pool is located where we can go easily.
Which do you like? This or that, I like sea because it has a sense of space peculiar to nature. I think it cannot feel at pool. So I recommend you sea if you hesitate which place you go.