Muffin button only appeared twice and Ghost Nappa has been done to death but they (seem) to have an end to that story for now. The main difference for DBZA and YGOA is that YGOA never updates (which is saying something) and when it does it is the same tired jokes it has been doing. Most of LittleKuriboh's best material has been invested in the Naruto Abridged series as of late which, again, he never updates.
The DBZA guys on the other hand take advantage of the rules of adaptation really well. What they add, adds a ton to the characters who are otherwise rather flat or enhance the cast (adding Nail to Piccolo's psyche was a stroke of genius). They remove/constrict a bunch of the filler fight animation and get straight to the good stuff.
Out of the 40ish material they put out for the series (including movies) I think there is only one I didn't laugh out loud at.