Get at least a 60-65mm bell, Any smaller aren’t worth it. If you can afford a swaro then it’s a no brainer, get it, ATS or X. X is more versatile down the road. If you can’t afford swaro the vortex razor or meopta, or similar priced are all good. As stated above it all about what you expect out of a spotter. With a razor you will be able to tell is a good framed deer at 1 1/2 miles. With a swaro you will be able to see the forks and more detail. I just used both side by side yesterday. Razors was good but not as clear. Of course heat waves rendered both of them useless in the middle of the day.