As far as i know only in France and in UK pilots fly QFE, the rest fly QNH.
In UK and in most of the french airports you'll have no problem.
Problem will arise when you try to fly an approach on QFE in a high elevation airport, say QNH is 1013 in an airport where elevation is 3000 feet, tell me how are you going to set QFE in an altimeter where in the kollsman window you can only set 960 mb and higher
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I have flown in several places, including France and UK, i had to use QFE, and in my opinion QNH is the best option.
The funny bit is that if you rquest QFE in most of the places (outside UK and France) it will take them more than a couple of seconds to provide you with it , because they wont be expecting your request in mos of the cases.