I play each of these balls from time to time.
Titleist Pro V1 - Ball X has similar if not a tad more distance for me and seems like less side spin. The Pro V1 spins a touch more on the green and is not as durable. Trajectory is very similar for me.
Taylormade Penta - Ball X has a lower trajectory for me with a similar straight flight and little ballooning. The soft Penta cover cuts very easily and stains quickly. Again the distances off the driver were very similar even with the higher flight, with a better rollout on the greens going to Ball X.
Bridgestone B330-RX - I actually see Ball X as being one from this family. My guess is a tough E6 cover with in a three piece ball. A bit more distance from Ball X with a bit more spin and similar soft feel, (may be coming from the better compression feel). I originally thought B330-RXS and could still slide that way.
Bridgestone e6 - Very similar dimple pattern along with the 330 line. Ball X seemed to have all the properties of this ball to me while adding more greenside spin and softer feel, especially off the putter. Similar trajectory and driver distance with the edge to Ball X.
Ok, there's my perspective for all the world, lol. I bet I'm way off, but without getting it on a monitor myself it comes down to subjection. Thank to THP and the Mystery companies for allowing me to be involved in this testing, I really had a blast as did several friends who got to give me their take.
If you're wrong, I'm wrong. We have similar thoughts comparing it to the Pro V1 & Penta.
It's ok though, i've been wrong once before.