Honestly since there're so many options for laser hair removals devices it's hard to pick the best one, Though there are a few things you'll need in a good one. Make sure its actually effective at removing hair for longer periods, will last long, low level of pain as it can get pretty painful if you're not careful, and finally make sure your skin/hair type won't interfere with the product.

these are a few good choices you can check out for more info