Flop's set up in a great way, and it has it's own obstacles to overcome. Height differentials - holo has none of this. Generally, on Flop, you want to be above your opponent (other than a few situations or if you're trying to lure them in a particular way). The spacing between jumps is great, i.e. side fence to second highest platform. The many different heights makes it possible to run away from trans, but still difficult, making the meta game prominent, yet not absolutely primary to the point where mastering trans and sucking at everything else can still win you games. Many different opportunities for luring, whereas in holo it's essentially limited to jumping at your opponent, then turning back. Pros and cons for multiple skills, though in holo there are some that are obviously above the rest (not completely overpowered, but definitely gives the advantage.) This one isn't huge, but flop gives the opportunity to differ from breakfall without imminent death. Charge can be deadly if used correctly, although it's a double-edged sword in the way that you can get ground hit. =/
I'll continue if you wish...