Carrying an auto involves several decisions:
1. It has to be comfortable to carry, or you will wind up not carrying it, and that is useless. Thus, thin profile is highly preferred - single stack is what I use for CCW. Double stack magazines are thick for everyday carry and they are harder to conceal easily in all types of clothing.
2. As for safety, this also has a number of issues: traditional double action (meaning first shot is double action, then all subsequent shots are single action) is extremely safe, since the chance of 'hit trigger go bang' is lessened since your first shot has a harder pull, thus you really need to want to shoot. As a new shooter of autos, this is what I highly recommend. Since you are used to revolvers, this is easy for you. You could also go with a double action only (DAO) but you'd want something with a "lighter" pull, like the Para Ordnance Carry 9 or Carry 45, depending on the caliber you prefer.
But most importantly, in a personal defense emergency, you do NOT want to have to rack the slide - you won't have time, your adrenaline will be pumping hard, etc, so you must carry one in the chamber.
If you use a 1911 model, that would meaning carrying cocked and locked, which is NOT a good idea for less than a very experienced auto shooter, so stay away from this to start with autos.
My top recommendations:
Find a great condition S&W 3913 - it's highly accurate, light and small enough to carry every day easily, and one of the best single stack guns ever made.
Find a Para Ordnance Carry 9 - sort of like a 1911 model, but with additional grip safety and what they call an LDA "Light Double Action" trigger - every shot is double action, but light enough not to be a hassle, and strong enough not to have an accidental discharge.
FIRST you need to decide what caliber, make the decision to carry it every day, and decide on your level of safety comfort. Do NOT rush into a decision, rent a few different types at your local range and try them for comfort, fit, size, weight, shooting accuracy, etc. Try each type DAO, SAO, traditional double action, LDA. Then and only then are you ready to make a purchase decision.