Neck through -- thumbs up...
Brass nut... Huge thumbs up... They don't put brass nuts on junk!! That was a point of notice when I bought my B2 -- i noticed that feature, because my '74 RIC 4001 has a brass nut with neck through... That bass really sings...
Practiced 2+ hrs yesterday w the B2, I really love the sound I'm getting from that bass, and I think exactly that while I'm playing, makes it so exciting to play, I get excited before picking it up to play... Neck through & Brass nut... This bass sounds great not plugged in, and I bet that Edge does too!
Like I said, junk doesn't have neck through, or a brass nut...
So, just on those two positives, I'd go for this Edge!!
Then add those EMGs... If the neck is good, $400, sound like a deal you need to move on, or it will be gone
Good luck... Rooting for you!!