It really depends on the manufacturer of yor props.
Some folding props are really bad and crappy, and I'd rather have a good fixed than a bad folding.
Same the other way around.
So beware, just because it folds does not mean its good, same the other way around.
I vote for folding, off course, but a GOOD ONE, not a crappy one.
What brands are they?
edit...Val beat me to it