When choosing the best Android emulator for yourself, start with assessing what you primarily intend to do with it. If it's only for gaming, you'll want a gaming-oriented emulator, but if it's for general app use, then your options are different.
You'll want to evaluate the emulator's ease of use, interface, performance, and pricing. It'll help to check whether the emulator has ads (and how pesky they are).
Make sure to look out for the account login process because some emulators may not let you use an existing account login. Lastly, look out for additional features like recording capabilities, gamepad compatibility, and rooting options.