I think I've used all of the bags mentioned, along with several others.
Several years ago I heard about Wotancraft and have been using their "trooper" series ever since.
https://www.wotancraft.tw/product/trooper-s-ash-green
I have a small and medium trooper. The small works well with either a Sony A7 series or Nikon Z series. It's the perfect size for my current combo of either a Z7 with a 24-70 f/2.8 zoom or Sigma 40mm f/1.4 prime. If I'm using a 70-200mm f/2.8 with adapter I have to use the medium bag. The medium is also my bag of choice when traveling on a plane as I can fit more stuff into it.
Both allow easy access to my camera. Both have decent padding (especially on the bottom), both have side pockets that can expand to be quite spacious, both have an "extra" leather strap on the outside of the main strap where I can store a bunched-up light windbreaker. They also don't scream camera bag.
I took the Thinktank Retrospective on a trip to Italy several years ago and my wife learned to stop walking when she heard the sound of velcro opening. Thinktank is thoughtful in that it is possible to disengage the velcro holding the flap down so you can open the flap quietly, but then the flap isn't secured at all.
With the Wotancraft there is no velcro. You can quietly secure/unsecure the leather strap or leave the flap open. But there are magnets holding the flap closed even if the leather strap isn't secured.
The Thinktank retrospective is a great bag. As is the Billingham. I've also used Ona bags in the past (
https://onabags.com/collections/messenger-bags), but prefer Thinktank, Billingham, or Wotancraft bags for various reasons (though the ONA Bowery is a very small and rugged bag which worked well with a Leica M9/MM and one extra lens).
Bags end up being very personal. There is no one bag that is right for everyone. I've personally found that the Wotancraft trooper bags work very well for me and I prefer them over any other bag I've used.