Any work fine I started with a cheap round one I bought at walmart. I rolled around a bit. I left it out and walked off one night.
I picked up this Kona on Amazon and am happy with it. It's octagonal so won't roll off. I don't know if it is the best but it works for my needs. Recteq you can adjust the amount of smoke though. its 12 inches because bigger and better. Honestly, a 6-inch tube would suffice and save on pellets as 2 hours most meats are done taking smoke. I chose the 12inch to add wood chips that burn much faster.
https://www.amazon.com/Kona-Best-Gri.../dp/B07RPBRDSJ