Bob-
Like anything else, you tend to get what you pay for. That said, all the scope brands you mention are good choices. For the most part, I use Leupold scopes on most of my rifles, and am 100% satisfied. There are a few brands that may be brighter, but at a lot more cost, and with no increase in durability.
I have two rifles with quick detach mounts, a Kimber 84 in 308, and a Winchester #70 in 375 H&H. Both are Warne mounts, and have no trouble staying secure, and returning to reasonable zero when removed and remounted. Reasonable to me means about an inch.
I have numerous Ruger and CZ firearms with the detachable factory rings, and have found they work well. There is a company (don't remember the name) that makes metal levers to replace the nuts on the factory rings that helps with quick removal and re-mounting. I have found that most factory mounts like the Ruger can be pretty repeatable R/E zero. The key is to try to mount the scope with consistency, wit the same amount of "tightness". Most of my Rugers can be counted on to re-mount within a couple inches at 100 yards. Not well suited to target or precision long range, but good enough for most any normal hunting. I have a half dozen rifles, and 2 revolvers, that I keep a pre-sighted scope for, in detachable rings, just in case. The second, back-up scope need not be expensive; a $100 Bushnell Trophy is fine. Its cheap insurance when you are traveling, and easier then carrying a second rifle on long trips.
Larry