Any will work, but as the plants continue to out-grow their containers, transplant them into larger pots. When growth slows, leave them in the pot they are in. As long as it drains well, you ll be okay. Sturdy, healthy, at least four sets of leaves on them. It works very well.
Chiles grow from full sun to partially shaded areas.
Consider the total environment, including shade, humidity, and soil composition when determining where to plant chiles. Some varieties, like wild chiles and the rocotos of the pubescens species, thrive in partial shade. Otherwise, test the soil with your finger to the depth of an inch. As is typical in any growing season, I lost some varieties due to nongermination, lack of vigor, and damping off. Fortunately, the other varieties flourished and I was able to answer my questions.