I have played for 55 years, am the son of a professional and a former Ping employee myself, and know a little bit about golf. I have done so many real-world ball comparisons on courses I know well that it's ridiculous. My driver swing speed is a modest 95-98, and I always come back to the Pro VI. (I just wish they made them in yellow.) There have been times when particular balls seemed noticeably longer, but real-world testing proved they weren't. Balls definitely feel different and have different spin characteristics, but at least at my swing speed there is simply no ball out there that is significantly longer. When I compare, side by side, balls as different as the Pro VI and the Wilson Duo (which I like), the distance difference is negligible (and the Pro VI is invariably the longer one when there is a difference of a few yards). I'm not sure about the suggestion above that the Pro VIx might be a better choice - it's intended for 105 mph and up swing speeds, feels like a rock at my swing speed, and certainly isn't going to do anything a Pro VI won't.
It reminds me of when I first tested a 47" big-headed (probably 360 cc at the time) driver at the range. I would've sworn on my grandmother's grave the ball was going 40 yards farther. It certainly looked and sounded like it. Took it out on the course and discovered I was just about exactly where I always was.
I also remember hitting 5-irons on a big open field. There was always one ball about 20 yards farther than the rest. I finally realized what was going on and started saying to my wife, "Dear, go pick up the Spalding Rebel." She wondered if I was psychic or something. Was the Spalding Rebel the longest ball ever made? No, the quality control at that price range was so bad I'd simply got a super-hot one. I've had the same thing happen with Pinnacles.
