I have three in 9mm, an older Colt Combat Commander, and two Tisas's GM's, a "Service" and an "Army" model. No doubt they are softer shooting than the 45's, but other than that, and the fact the ammo is cheaper, there really isn't a lot of difference.
All the other 1911's Ive had in the past were 45's, and they all followed the traditional design, with the ramp in the frame, and the Colt I have in 9mm, does as well.
The Tisas 9mm's have a ramped barrel design, and between it, and a couple of, or combination of, other things, they have been between a good bit fiddly to downright annoying. After a good bit of fiddling, especially with the Service model, I have them both running about 95% now, but Ive put a lot of time and ammo in with them and I still seem to have some sort of issue or stoppage with them every time out.
One thing that seems to be a bit more of an issue with the 9mm is the mags. I have a bunch of MecGar's, as they came with the guns I have and I bought a few more. MecGar has two different designs, a 9 rounder and a 10 rounder, and so far, the 10 rounders seem to be the better way to go if you go with them.
The Colt I have doesn't seem to mind any of them, although one or two of the 9 rounders will on occasion puke a live round out with an empty while feeding. The Tisas are a bit more picky and the mags randomly work or have trouble, and there doesn't seem to be any rhyme of reason why or which ones.
If I had to do over, Id probably buy a couple of each maker and see what worked best. I just hate having to buy specific mags for specific guns of the same type. This isn't just a 9mm 1911 thing either, my 45's are/were also somewhat picky with different brands, and the only mags that worked reliably in all my guns over the years, were a lot of surplus USGI 7 rounders I bought back in the 90's. Even the Wilsons I have wouldn't do that.