Will post later tonight or tomorrow
Edit: Here it is. Again... please keep in mind that I am <10 hours with the AI.
The biggest difference b/w the two frames is probably the feel of the string bed upon contact of the ball. The 97 is going to give you a more stiffer, thud feel while the AI is going to give you more of a softer, more muted feel. I am going to attribute this to the difference in flex. Although I am used to a more solid, thud feel (GSP user for a couple years), the one thing I disliked about the 97 was the unpredictability of the string bed. I might be harping on a complaint that has been vocalized quite often, but I found consistency within the string bed to be lacking. (I tried numerous string setups, and eventually tried full poly to try and relax the power. It worked, however, I lost the feel and put away power of the racquet that I never was able to find a balance between power and control with the racquet.) I also find that a stiffer frame gives you less dwell time on the frame thus the ball pocketing can be affected. However, there is a trade off here with power. I find that the stiffer, thud feeling frames are all a bit more powerful. Thus, when I have used stiffer frames in the past, they have all been dense patterned frames. The AI 98 has superior control to the 97 and I am able to hit my targets and spots more frequently and with more accuracy. I have barely done any serving with the AI so I can't comment there. Volleying is again a tough ask to do a detailed comparison at this point. One thing is for certain... I am still trying to adjust to the feel of the AI as well as the beam construction. I have never used a frame that has an aerodynamic beam.
Overall, these observations are the only sure-fire things I can really claim between the 2 frames. Sorry for not being able to really delve deeper, but I don't want to write about a racquet when I really haven't played a single match with it yet.
If you ask specific questions, I can try to answer them the best I can (if I can)