Munji, when you said AG500 you were talking about the TH500 right?
I agree with you that most of it boils down to subjectivity of taste. For my dough I like something simple and built like a tank.
That's why I may lean towards the TH500. I also really like the sonic footprint of my DB750 and I hear the TH500 comes close in that department.
I had one of those Eden's I think the model was a WTX 260. Not a bad sound. Kind of tube-like but sounded compressed somehow, not open and breathy. It was also pretty weak and would clip out trying to drive my D10BXD cab for gigs so I parted with it.
Perhaps it's not an even comparison with the MB800 having more watts listed, but can you tell which one in the group you have there seems to have the most raw power and headroom? Still subjective I know, but it's always good to hear opinions.
Although I miss the sparkly eyed redneck avatar, I'm chuckling that you have Devo Jimmy

It's like snatching the other team's mascot

Well done!