First preference is 7-round Colt-style magazines (metal dimpled follower and 11lb springs). The first thing I did when I received my XSE Government with the current 8-round magazines was to replace the short-legged, folded-leaf followers and reduced power magazine springs with standard design dimpled followers produced by Metalform and Wolff 11 lb springs.
After some personal testing I've also adopted a number of ACT-MAG 8-round magazines (both as provided by S&W and from Wolff) which have exhibited good functioning in my Colt XSE and SW1911SC. I haven't asked S&W which magazine spring they're using in their ACT-MAG magazines, but I noticed it seems lighter than those used in the ones sold by Wolff which I've been using (Stock No. 32770, in which Wolff states a +5% magazine spring is used).
I keep telling myself that I have to get around to trying the current 7-round magazines offered through Wolff, too.
In that vein I also haven't had the time to try any of the newer Tripp Research Cobra Mags. When I ordered a couple of the then-current production magazines from them last year I was told they were in the process of switching vendors for their magazine bodies. The explanation offered was that the new vendor was going to offer improved tolerances in the magazine body. I'm curious to see a couple of the newer ones.
I was also told that due to variations in the dimensions used by the many of the different manufacturers of 1911-style pistols nowadays, that it might be necessary to order one of their different magazine followers (different engagement dimensions in the follower's metal insert in relation to the particular pistol's slide stop lever engagement surface). I've had a few instances of the slide not being locked back on an empty Cobra Magazine, so there may be some merit in trying another of their followers.
I have a couple of cardboard boxes of 1911 magazines which I've accumulated, tried and stopped using over the years. Don't ask me why I kept some of them when I discarded and tossed so many more of them.
I still have some of the early Vega, Devel, Pachmayr and Shooting Star 8-round magazines, none of which eventually seemed to consistently demonstrate the sort of reliability I desired for my needs, especially when different JHP ammunition was being used. Ditto some Wilson magazines for both Government/Commander & Officers Model. I used to have a lot of them, but only have one or two of them left (found one I didn't realize I still had) ... and I finally reached the point where I didn't even feel like using them for range training anymore.
After having tried so many different magazines over the years I've reached the point where I don't have an 'inflexible' preference, or a particular inclination to 'brand loyalty' . I've come to accept that the potential for QC issues to arise with anyone's product is always going to be present. I examine and function-test each and every example I received from each and every manufacturer/vendor. Sometimes a magazine may require replacement of one of the components, or the magazine body itself may require replacement. This can happen ...
I grant that I've been influenced by talking to various manufacturers and vendors and listening to the problems they've encountered either during production, or when receiving components from still other manufacturers for use in their own 'name-brand' products. Things happen.
I have little doubt I'll continue to examine and test 1911-style magazines as long as I own 1911's.