What are the best GBA Emulator?

Question already asked and answered in the site.

Hey there again! :) So I did a search around the site and found that there already is a question similar to this one right here so you might want to check that out. I'll be flagging this as a duplicate. Hope that's okay! :)

Hey dhavalpatel! I was wondering, do you have a specific OS in mind that you will be using the emulator in?