While EUF is far more commonly avaliable, ENF, in my opinion is far more exciting. I could take it one stage further and say I like it even more when the lady in question is also shaved.
This is rare, but it happens on occasion (For example, Cercei Lannister in the book version of 'Game of Thrones' is not only stripped of her clothing, but her vagina is shaved as well. This particular fantasy crops up in a lot of ENF fiction as well. The victim either having recently shaved and regretting it or being shaved by some circumstance of her situation).
I suppose the level of nudity and exposure is one of the important aspects for me. EUF just doesn't bring the thunder the same as full nudity (though I can respect it as its' own thing). Like any sexual fetish there's no right or wrong answer. It's always going to be down to personal preference rather than one choice being the correct one above all other