IMHO you need to try the various emus out for yourself. Some have features that will be important to you while others will have features you find useless. In other cases there is only one emu available so your choice will be obvious, as is the case with the GBA I believe. So go ahead and have some fun. Try them all out and find out which emu's you prefer. You can always get rid of ones you don't like.
Here is a link to a nice set of various emulators with ROMS but you must be able to download torrents to use. Assorted Emulators and ROMs
Better yet there is a very good selection right here: http://www.dcemu.co.uk/vbulletin/showthread.php?t=8972
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