As a general rule, I will keep the ball as low as I can get away with. That being said, I prefer to use one club (my 60*) for most all shots within it's full swing yardage excepting sand shots. I can still get it low, but it won't be as low as if you were to use a 7-iron.
In this case, I would go with a pitch shot 9/10 times depending on the conditions of the shot. With a buried lie, a flop shot for me is almost completely out of the picture. I have hit a flop shot from a buried lie exactly once in a competition round, and it sticks out only because I was amazed that it worked due to pure dumb luck. With a fluffy or good lie a flop shot comes into play, but only if it fits the conditions of the pin. If the fringe short of the pin is slanted back towards me I will hit a higher than normal pitch and land it there to get it to check up.
What I'm trying to get at here is that I will only hit a "true" flop shot (face nearly flat on the ground, pointing almost 45* away from me) is when I am playing on a course with quick greens and hitting onto a downslope. I'll swing away to try and launch it into the air, while still attempting to land it on the fringe. If it doesn't land there my best bet is that it will come down from high enough to negate most of the rollout. If the greens are soft enough you can get the shot to stay within 6 inches of its mark, whereas firm greens mean trouble. Bouncing a ball in the rough to slow it is preferable to me as opposed to flopping onto cartpath greens.