The parameters for the selection of the pot are its dimensions in relation to those of the plant, its proportions and the material of which it is made. Do not forget to note the presence of the drainage holes, which should prevent the accumulation of water on the bottom of the pot.
For succulents is preferable to opt for pots wider than high, so that the surface of the substrate exposed to the air, is wide so as to facilitate the evaporation of water. In the deep pots it is possible that the soil at the bottom is always a bit wet.
For globular or shrubby cactus the space between the plant and the edge of the pot must be at least 3 or 4 cm, so that it can be easily watering and that the free surface of the soil is sufficient to avoid the cover effect. A globular cactus or a shrubby one grown to such an extent as to reach the edges of the pot covers the entire surface of the substrate that, covered by the body of the plant, thus remains moist much longer, with consequent danger of fungal attack.
As regards the material, the commercially available pots are more frequently in plastic and terracotta. The plastic pots are lightweight and unbreakable, but do not allow the transpiration of the soil as terracotta pots, which have however the disadvantage of being heavy and easily broken; also over time they become covered in unsightly deposits of mineral salts. As the plastic pots do not allow perspiration, to small plants are preferred because with a terracotta pot the soil on hot summer days would dry too fast, if it is sufficiently porous.
Very often the most appropriate pot for your plant is not commercially available and you have to adapt, but if you want to spend a little more for the most beautiful samples of your collection of succulents, you can buy the pots used for bonsai. These generally are shallow and much more robust than common earthenware pots; also from the point of view of aesthetics are superb and among the rough and glazed if you can find certainly several that marry perfectly with the character of your succulents. In particular, I find them appropriate for shrubby globular or not cacti and compact habit succulents so low and acaulescent like many agaves, haworthiae and lithops.

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