I did test the PS X, though it has been too long ago for me to remember finer details. They headlines would be that the PS X was probably a bit too much for me - it felt more controlled but less forgiving in the sweet spot. It was higher swingweight, which gave it less mobility but more plow. It has a firmer feel with more solid feedback compared with the more plush feeling in the Blade. While the PS X characteristics are ones that I should prefer on paper, it was made for a stronger and more advanced player than me. It requires you to supply more energy into your swing - if you do, it will reward you with more power than the Blade. The Blade 100 v9 is in a better zone of forgiveness and power/control for me. The Blade would help my sense of feel and touch where my game is at now. The PS X would do that if my fundamentals were just a bit sharper.
An analogy is if you wanted to hit a fast pitched baseball, you would choose the PS X if you were very confident in your swing. Swung correctly, and making contact in the sweet spot, it would return more power in kind to the ball. The Blade 100 v9 would provide stability and comfort for more off-center hits but would have less peak power. The PS X will produce more home runs, but the Blade will hit fewer foul balls, better batting average, and more comfort if you hit it just off the center of the barrel.
An analogy is if you wanted to hit a fast pitched baseball, you would choose the PS X if you were very confident in your swing. Swung correctly, and making contact in the sweet spot, it would return more power in kind to the ball. The Blade 100 v9 would provide stability and comfort for more off-center hits but would have less peak power. The PS X will produce more home runs, but the Blade will hit fewer foul balls, better batting average, and more comfort if you hit it just off the center of the barrel.