I have played with all three.
Stratus Power Wood (SPW) is a 5-ply wood blade but quite thick (~6.2 mm) and it is fast (for 5-ply normal wood blades). It is supposed to be an improvement over Butterfly Petr Korbel (5.9 mm in thickness). But given the big head and big handle, it feels quite bulky in my hand. On the other hand, Korbel has big head but thin handle, so it is head heavy if you use heavy rubbers.
Samsonov Force Pro (SFP) is 7-ply wood blade with thickness only ~6.3 mm. It is fast as well, but because my SFP is only 87 grams and my SPW is 93 grams, SPW is a bit faster from my point of view. Although SFP is 7-ply but it has a bit of flexibility, making it quite good for looping. Besides it is not as head heavy as SPW. It does not feel as bulky as well.
Samsonov Force Pro Blace Edition (SFPBE) is 7-ply wood blade with thickness ~6.8 mm, very similar to Stiga Clipper (~6.9-7.0 mm). It is stiff and a bit harder compared to Stiga Clipper. Speed-wise SFPBE is supposed to be a bit faster compared to SFP, which in general is true. But given the SFP's catapult effect, if you swing big, the catapult effect makes the ball travels faster. So I understand the conflicting reviews in German forum, as one said SFPBE is faster while the other said SFP is faster. Basically it is how you utilize the blade (if you are used to 5-ply blade, then you can utilize the catapult effect better), but overall (in general, for many aspects of the game) I would agree with Yogi Bear, SFPBE is faster.