Good comments on the swing weight issue. I think other highly relevant issues are the speed of the court, the height of the bounce, and the opponent's pace and spin. Where I am, most of the "season" is played indoors on very low-bouncing, very fast indoor courts. In the summers, which is out of season for USTA, most matches are played on very slow clay or fairly slow hard courts, both with higher bounces. Long story short, the slower, higher-bouncing clay lends itself more to a lighter racquet and faster racquet head speed to impart more depth and spin on the ball. On the other hand, on the indoor courts, a much higher swing weight and twist weigh have significant advantages to overcome the lower, skidding bounces and when returning big serves that are sliding through with a bounce at waist high or lower.
For me personally as I have improved and when playing at a higher level, my RF97A was the most effective on Day 1 of playing but that faded Day 2 and Day 3 and so on if I played multiple times a week. I went lighter (300g, 318 swing weight) and found the same thing. Very effective on Day 1, less effective on subsequent days. Different reasons for both. For the RF97, I would be fatigued and my footwork would suffer-- that racquet is too demanding for poor footwork. For the 300g racquet with low swing weight, I had to keep up too much racquet head speed. As I fatigued throughout the week, I wasn't able to keep my timing, racquet head speed, and plow where it needed to be. So, something in the middle is where I play my best. 305-315g (varies based on swing weight and twist weight and balance), 320-330 swing weight, and a twist weight of 14-15. Trying now to find out what specific mix of those specs yields the best results and most importantly leads to fewer niggling injuries. That said, I been experimenting with poly tensions of 40lbs and less and find that those tensions can compensate somewhat for having a lower swing weight. Right now, the best mix of specs seems to be a Blade 98 v8 18x20 that is nearly on spec. 332g with 326 swing strung with overgrip and dampener. That spec seems to have me hitting on time and in the sweetspot more often than not.