Thanks a bunch, now I'm wondering, is there a list of the "best" or the better emulators here on gbatemp?
Best is a rather subjective concept that varies from person to person.
Some will opt for speed if the accuracy is OK enough for most purposes.
Some want accuracy at all costs, or a specific type of accuracy (for audio stuff have a look at what some of the people making playback filters or playing on hcs64.com have to say about things, in my case though I am not what you would call musically gifted and decades of power tools, concerts and loud engines combine with an already bad baseline so I don't care as long as it still sounds good to my ear).
Some want fancy filters.
Some want really fancy filters (for 2d stuff I will usually go with the SAI family but you can get quite impressive stuff via other means that the basic nearest neighbour and light smoothing stuff won't handle).
Some want features (savestates, rewind, high speed, turbo buttons, recording options)
Some want expansion of console features -- widescreen hacks being a common starting point here, though serious resolution rendering increases are options for some.
Some want debugging options, cheat making and the like.
Some want debugging options but rather than homebrew or ROM hacking they are about speedruns, oh and speedruns might be broken down between conventional and tool assisted.
Some want things to use with various approaches to hacking games (be they texture replacements in 3d consoles, hacker made mappers/special chips, inaccuracies that help make certain hacks easier or at least what certain hacks were built to run on, )
In any case I have yet to see an emulator be all things to all people, with the possible exception of FCEUX for the NES. In most cases most of the emulators that were popular 10 years ago will do just fine today if you get their latest version/fork.
Also the GBA has a mode7 equivalent.