Mine is a Fobus, . . . double mag, . . . paddle style that I often use when carrying a 1911. It is a slick black plastic, . . . retains the mags well, . . . but allows them to be extracted very easily.
I'm going to make myself a fancy leather double rig, . . . just haven't gotten around to it yet.
I will also probably make one covered in denim to match my denim covered holster.
Best bet for you is to go to an IDPA shoot or something like that, . . . ask questions of the guys there, . . . most ranges are cold, meaning you can't be handling your guns, . . . but mags and mag holders are in abundance and it is a good way to get a feel for what you might like.
May God bless,
Dwight