As far as Velocity goes I have used Synergy, A23, Atlas, Cliffhanger, Quill, and Aileron-a disc only rim. The Synergy offset was the one prone to cracking, maybe the non offset too. I had an offset rear 36 hole crack years ago. There are many improvements in modern rims nowadays-including the Brevet, Quill, and even the A23. The Atlas is not new, but is a traditional box-section and non-tubeless. As said, it is heavy duty workhorse, no-bling rim for touring and tandem. The "fit and finish" is lesser than Velocity's "premium" rims (the word the Velocity rep used) but nothing that affects the functionality and they seem to be great for what they are. I built up a rear for our tandem and it built up easily and has stayed true through loaded touring, etc. The more premium heavy duty rim from Velocity is the Cliffhanger. I just built up one of those for the front of the same tandem. (Would have used on the rear but there clearance issues because of their width). Both of these are overkill unless you want expedition level touring wheels.
I have Quills on my main bike, and they are awesome. The polished were $170 each. That hurt but I was splurging. I have a set of Brevets that I got on the amnesty program, so were half price. Have not used but all reports are good on these rims. In my mind it would come down to aesthetics and perhaps price with Brevet vs Quill. You could throw Hed Belguim in there too, which I have also used and now have on a commuter bike. They are awesome too but I like Velocity.
You really cannot go wrong with Quill or Brevet. Or even the A23. I've probably put more miles on that rim than any other rim. Again, awesome. That rim may not be in production any longer-the Quill is the latest evolution.