Depends. For concealed carry I prefer leather, considering making a kydex lined holster but haven't bought any kydex yet.
OWB I use a blackhawk serpa or a high ride belt slide.
It also depends on what you will be doing for the day and your own preference. A lot of people like crossbreed or hybrid type of holsters (leather and kydex). One of our site sponsors also make good kydex ala raven concealment.
Are you looking to CC or OC or both? What kind of activities are you going to be doing? Do you need good retension?
Depending on a lot, the type of holster you may need can very greatly...and as such...a lot of people have more than one per carry gun...heck I have 3 for my 5" 1911 and 2 for my 4.25".