Visual boy advanced and its variations are the most popular gameboy advanced players, it also plays gameboy color games no problem, only thing is its no longer under development so several other people have picked it up and started adding features to it. I want to say the most up to date variation is vba-m but I might be mistaken. Also iirc its no longer possible to get the original vba directly from the person who made it, so there can be a risk getting it elsewhere instead of a variation, most notably some of the rom sites are risky.
I don't encourage using rom sites to get your roms but if thats how you've decide to do it, and there's no changing your mind, you should avoid using sites that use installers. Installers on these types of sites are notorious for giving malware and pups(potentially unwanted programs).
