Buy a prop which will let that engine turn a minimum of 6500 rpm.
The brand ?
really not a big deal -
Why?
test a few props
If you are choosing between brands which are same diameters and turn same static rpm - the performance wil be in same ballpark.
Notwithstanding all the guesswork in this new engine -- you can bet that when it is all sorted out - it will prove to be a good "60".
Not a good 80 - but a darn good 60.
The best prop is the one that works best for you -on YOUR engine/muffler model combo.
The 25x8 may /may not be best.
If it spins 6500 or so -should work fine .for your 3D work.

You want enough power to pull UP from any maneuver -no matter how slow the plane is moving or falling . . I have made good props from "bad" props-and vice versa and to think that one brand is clearly better than another -without qualifying the entire setup - is folly.