Originally Posted by BreakPoint
Personal preference. Same reason some pros use full poly strings and some do not, and some string at higher tensions and some string at lower tensions, and some use smaller racquets and some use bigger racquets, and some use heavier racquets and some use lighter racquets. It's just what you're accustomed to what your strokes and timing are grooved to.
This, pretty much. All the pros have great techniuque, (well, DUH!), but the racquets they use just reflect what they happen to like. More often than not, this is whatever their first 'good' racquet was like when they were teenagers..