I don't use a belt unless I'm going for a double or single in the squat. I use an Inzer 13mm two-prong. You don't want to rely on them and have an underdevolped midsection/lower back. In fact, you should try to avoid all support gear because it just acts as a crutch and you'll end up relying on them too much, causing an imbalance. e.g. underdevloped grip strength due to the use of straps.
But to answer your question: I believe Inzer, hands down, makes the best belts and wraps in the industry. APT also has very good belts and are a bit cheaper than Inzer.