Cabinet wise, I'd choose the Ampeg. I've tried a number of Eden cabinets (D210XLT, D410XLT and 210XST) (albeit not on a gig) and I don't care for them. I do like the 410HLF though (haven't gigged with that either).
I presently have a D410XLT in my basement, as one of my Avatar B212s had been lent to a TalkBass brother for a gig tonight. At home, he said he LOVES the Avatar, we'll see what he has to say tomorrow after the gig.
I really want to like the Eden XLT cabinets...they have a great rep and they certainly look cool...but my ears tell me that I like my Avatars better.
I've never played around much with an Eden amp...kind of afraid to as they aren't cheap even on the used market and I don't want to get a serious jones for one.
How about an Eden head and the Ampeg cabinet?