What I've seen -- long time firearms instructor here, also worked as the editor of Concealed Carry Magazine for 4 years before moving on -- is that
- the standard cut interferes with a good, safe, efficient draw because it is almost impossible for most users to get their thumb into a solid grip on the gun while it is in the holster (which leads to slowness and some unsafe fumbling), but
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- the combat cut eventually folds over so you have a 'shark fin' that flops down to cover the holster when you want to put the gun away.
Of the two, I consider the combat cut preferable because it is possible to safely draw the gun and put it away even after the shark fin starts flopping. Learning to do so takes some very deliberate practice and care, but it is quite doable.
If the flopping bothers you but you like the look and feel of a hybrid holster, the Galco King Tuk (which is an obvious copy of the SuperTuck) uses a slightly thicker backing for more structure. It's still very comfortable.
Hope this helps.
pax