I've got both but all my commercial is private, hotels, nursing homes, private school etc, no big chain stuff. I also do a lot of mansions, stately homes etc.
My mate is all commercial & I wouldn't work for what he gets paid! I get more for small bungalows than he gets for likes of a NEXT store! He recently told me he was onto a good earner with a University, inside + out. I wouldn't have even done the outsides alone for the same price!
So to answer the question- it would be all "private" commercial for me. However, I'd rather do all domestic if the commercial was chain stuff, shop fronts etc.