I've been doing some playtesting for Donnay in New York for the last month or so. I am VERY impressed with their line of racquets. Top to bottom, they are putting out a great product line.
as for the two frames in question here... these are my thoughts.
whereas the x-red is listed as heavier (330g to the blues 320g), i feel the x-blue swings heavier. the blue feels a little stiffer when striking the ball as well. I found that I really enjoyed that when hitting serves and two handed backhands with the x-blue 94.
since experimenting with the racquets, i've noticed that I really had to drop the tension down from where I was with the Head YT Prestige. (60lbs with the Prestige, 53lbs with the Donnays).
both racquets allow very good access to spin. of the two, i was surprised to find my ball was getting more spin with the 18x20 x-blue 94. I've only played with both in their stock settings, and have not really tried messing with the customization kits yet. I will post some more info on the way they play with some customizing when I get a chance to play more with them this weekend.
sorry i am just firing out thoughts as they come to my head. i feel i am bouncing all over the place here haha
serve - advantage x-blue 94. power is better, control felt a bit better for my game. Flat and slice serves were great. Amazing access to spin for my kick serve, although I may have been getting a bit more kick with the red.
backhands - advantage x-blue. with the way i swing, the 18x20 string pattern really allows for my flatter backhand to come to life. I really feel confident swinging away with the blue. The red felt good here, but I felt like it pocketed the ball a little too much for my liking here, and I was sending more shots long. Maybe with some customizing this could be remedied though.
forehands - wash. really liked hitting my forehand with both frames. They are both heavy, but plow through the ball nicely. After dropping the tension down, really ripping the ball becomes almost effortless with both racquets. Tons of access to spin from both if wanted, but I felt I may be getting a bit more power and spin from the blue.
volleys - blue all the way. the x-blue 94 is one of the best volleying racquets i've ever hit with, hands down. great feel, great control. don't know what else to say. the red is good as well, but i like the balance and weight of the blue better at the net here in my opinion.