If you're buing a dedicated CC weapon, then hammerless is nice. If you'll use it for anything else (plinking, hunting, etc), then you'll likely want the hammer.

The ruger hammers are made for shooting. They're not necessarily very big to excessively snag on stuff, but like any hammer, they DO stick out.

The hammerless model is DAO, it doesn't have a single action notch, so it really cannot be fired SA (sometimes I trick my bobbed hammer S&W's by pulling the trigger part way, then hooking the hammer with my thumb to SA cock it, a Ruger spurless will not do that). The springs in the ruger from factory are HEAVY (14lb mainspring), you'll want to replace them no matter which model you get, but in a spurless that I wanted to pleasure shoot a bit, I'd get even lighter than what I'd use in a spurred gun.

One trick: Buy a hammered model, remove the hammer, send the revolver to ruger saying that you tried a bob-job and botched it (or that you dropped it and broke it, but they'll ask for the broken hammer before they warranty it), they'll replace it at your cost. Now you have 2 hammers. Bob one, keep the other for plinking. Takes 5min to change out.

So personally, I'm not a fan of DAO revolvers, would much rather have a spur, since I shoot my guns a LOT for pleasure, and thankfully haven't had to shoot them in defense of my life yet.