In the case of large plants, it is better to choose a pot one size larger than the size of the root system. In the case of large plants, attention should be paid to the correct condition of the roots, so that they have enough room to grow, but not more than enough. There is one nuance: if the pot is too big, the plants will have difficulty adapting and the moisture will not evaporate well. I was recently looking for suitable pots for my large plants and came across
https://idealistplanters.co.uk/extra-large-planter-pots/. Oh, there's a great selection there, and you can buy pots based on the type of growth of the plant. There are also size and material recommendations there to help you choose the best pot. In general, you should focus on the size of the root system, but it is worth remembering that plants grow, which means you need to think about the size of the pot as well.