They all work the same. They all allow you to attach old and/or different lenses to your current mirrorless camera. Its just that most are a little bit off in regards to infinity focus. I can't say there's a best brand name or anything, but i certainly will not stop you if you want to buy the expensive adapters. I only own 2 cheap and different adapters and don't how much better the expensive ones are besides looking cooler and higher quality.