They are both very comfortable racquets.
If you like PK I would stay with it.
For me it does almost everything better than DR.
More power, more control. Groundstrokes are much better, especially the two handed backhand. There is more power and control.
I find DR98 a bit disconnected. All the flex is in the throat.
DR has a higher launch angle and It serves better.
What really bugs me about the DR is the thick beam in the hoop. It makes slice backhands that much more difficult.
I like to play with variety of racquets. PK7g is the one that I have best results with. (I just wish it had the PT280 feel, and bombed serves like Gamma Tour 340x, that would make it the holly grail)
Hope this helps.
Sent from my iPhone using Tapatalk