just because you are 6'3'' doesn't mean you can conceal things easily. If you have a thin waist or even your body shape can make certain guns print on you every time regardless of the holster.
I really like IWB holsters that are used at the 3-4'oclock positions. Good access, good concealability, good comfort.
I have a Crossbreed SuperTuck (takes FOREVER to get to you) and a Galco KingTuk (actually not bad quality for a premade universal one). Both of those are practically identical.
I can't stand front IWB holsters, they press too much against my diaphragm and make it hard to breathe.
I use a belly band for my LCP when I'm running, works really well.
OWB holsters are fine...but they are not very versatile. Sometimes a situation demands you to put your jacket off or long coat/shirt off
For a large gun, you can just forget about considering shoulder holster. If you do get one, make sure it points the barrel DOWN.