I just went through the same process you are facing and hopefully I can shed some light. I carry a 340PD as my pocket carry, and a somewhat customized Colt Series 70 as a full size. I also have an M&P 45C, which is a great gun, but just a bit thick for my every day carry option, and I'm not really thrilled with plastic guns.
In choosing my EDC I wanted a .45 because that's what I like for many reasons, and am set up to load this caliber. I also wanted a 1911 because I'm very comfortable carrying and shooting this platform. I eliminated barrel lengths shorter than 4", because of my past history with a Colt Defender that just didn't like me. I know they seem to work fine for a lot of people, but not me or my shooting buddy. After two trips back to Colt and one trip to my local gun smith I gave up because the testing of my carry ammo was breaking me every time I sent it back.
I won't bore you with all of my choices, but I chose a Range Officer Compact because I have owned a SA Lightweight Loaded Champion in the past that was a very reliable shooter. I just couldn't get by the OD green painted finish so I sold it. Stupid me should have just had it re-finished. I like the way SA does their ramped and supported barrels, and their duel spring system has proved to be a winner over the years. As far as comparing size, the ROC slide is a fraction wider than a Colt, but the grips are thinner due to the thin grips they put on the gun. The difference in the slide width will never bother you. My ROC is riding in a holster that was made for my Colt. The ROC actually made the Colt fit better. And of course the ROC has an Officer frame which is a huge advantage for a carry 1911 of any size. I always like the original Colt Officers model, but they were not all that reliable. The ROC is just like the original Officers with a 1/2" longer barrel and a reliable operating system.
I carry this gun every day when appropriate, and have found it to be a great CCW. I only have one complaint, and that is the slide finish. Personally I don't care for a parkerized finish, but so far it has held up well. At this point I love this gun and shoot it well. For the price it's a winner in my mind, and has proven to be 100% reliable with my reloads and HST, which is my carry ammo in all of my 45s.
The changes I made for personal reasons:
1. Replaced the thumb safety with a Gunsight Lo Mount Safety. Stainless because I already had an extra. These go on all my 1911s.
2. Changed the long trigger for a Greider Videki style short trigger (no over travel set screw)
3. Changed the ILS MSH with a S&A 20LPI.
4. Installed a Wolfe 21# main spring.
5. Installed skate board tape to the front strap.
Good luck and let us know what you choose.