Emulator Screen Capturing (Best Way?)

[phantasy]

Im interested in doing videos of playthru /walkthrus of games: I see Sega's Fusion emulator has a very good AVI capture, but not all emulators feature this. I may want to do live commentary with an external mic so what is best or easiest to get good quality?  I could do an emulator + Audacity combo for separate audio/video or screen capture software. I am having a hard time with Cam Studio and OBS Studio but still testing.  Any advice?

Recording MAME and RetroArch would both be good.  Here is a start:

http://emulation.gametechwiki.com/index.php/Recording_Video