From a starters point of view, WoodR4 is much superior, you just download the files and throw it into your root(and it works with most games)
YSMENU on the other hand you gotta dl the TTMENU from a specific site because the owner is a nazi and doesnt want it prepackaged, the manual route of putting together this firmware is complicated for someone who isn't computer sound and even the automated firmware creators I've seen messed up by noobs.
When it comes down to it, WoodR4 is superior, the updates come bi weekly so far, which is not bad at all, while for YSMENU, you must wait for extinfo.lib updates that don't always seem to work and are dependent on users of the forum to create instead of an actual team, not to hate on those putting the time to fix it, but its a lot more rough method than the Wood R4 releases
Also, sometimes you have to use patched roms, while with Wood, raw roms work great
It's time to move on guys, converting your saves over is a matter of rightclicking the SAV and changing extension, I don't understand why people are still even using YSMENU, what baffles me even more is people who are using Wood but are running YSMENU executable...its compatible with LESS GAMES
Also, there is no game that is compatible with YSMENU and it isn't with Wood, so ya'll need to wake up and smell the Wood(no homo)