You can find tons of information on the differences. There is plenty of word documentation on this and other websites. If thats not your cup of tea, there are guys like Mark Crossfield and Rick Shields on youtube who test and compare equipment and they do a pretty good job. A lot of their videos are pretty good. What it comes down to as far as i know, and Im no engineer, the 3 drivers have different capabilities as far as center of gravity and launch settings, all related to getting optimal launch with fast ball speeds and low spin. Check out some of this videos and then hit up a Titelist Thursday somewhere and find out for yourself!

Most golfers will benefit from the forgiveness and ease of launch of the TS-2. The better golfers will benefit from the penetrating flight of the TS-3. For better golfers that can't get an optimal spin rate with the TS-3 there is now a TS-4.

I had, or still have the 917 D2. I tried the TS2 very quickly last fall. I had money in the shop to spend and had been going back and forth between my 917, which I loved the look and feel of, and another brand that was more forgiving on off hits, (which I had been doing much last year), one known for its forgiveness above all else, especially the sound. However, the reason I grabbed the TS2, was not only the feel of it that I loved, but I found it just as forgiving as the back up other brand had been, and it has superior sound. All around it was everything I wanted and gave me the best of both worlds. The "other" brand has not only not been in the bag since, but it's not even in the trunk for back up either. Nothing against any others, especially the TS3 and now TS4. Different strokes for different folks. You'll see a variety of the pros using all of them on the Tours.