All plants require drainage, so just check the drainage holes. We do sell a few pots that are designed for water storage.
Plants that are short lived or replaced annual or a little less often can go in any shape of pot.
Some woody plants which form an extensive and tough root system can be virtually impossible to remove from pots that have a neck narrower than the middle. If the plants are valuable which Acers and Camellias can be, you might need to crack the pot to remove the plant several years later. All shrubs have a limited life in pots and will ultimately need moving to a larger size. Therefore choose conical pots for these valuable subjects.
It’s much easier to pot a plant on if the there is a decent gap between the plant root ball and the side of the pot. If you are going to pot a plant on, you might as well give it’s roots a generous amount of space in which to grow.