I like using terra cota pots. I grow a lot of pre-bonsai stuff in them, and keep a lot of my “will it grow here” plants in them for a year or two before committing to using one for bonsai.
I’ve heard from other sources that colanders are great, but my summer heat dries them out way too fast, especially if I want to use a soil with few organics.
Plastic pots also get too hot way too quickly, making them a bad choice for me, especially if I’m using a lot of organics in the soil. I am talking about nursery style plastic pots, though. I’ve used a couple of plastic bonsai pots and some mica pots that have worked pretty well.