My normal wear is shorts and a t-shirt with perhaps a light weight unbuttoned untucked over-shirt. When wearing an over-shirt my preferred holster has long been a shoulder holster; horizontal for smaller handguns, vertical for the larger one.
I also enjoy OWB holsters and there it is slight cant strong side and retention strap for revolvers except when a Kydex snap fit holster is used. Most of my Kydex holsters are paddle style.
I do own quite a few IWB holsters but they all reside in a Box of Shame for most of their lives. Every once in a while as mentioned above one might get to go WalkAbout.
Regardless of what Primary Carry method I choose there will also be a fallback; most often in a pocket holster but in the case of a few really safe handguns loose in an otherwise empty pocket.
My preference for shoulder holster is mainly for access. It is the most accessible style whether standing, seated, in a car when belted. It is also the most secure style to prevent a snatch & grab.
I prefer leather over Kydex, custom fit over generic, secured over unsecured.
I have far more Bucheimer holsters than any other make.