Slower/better dampening, easier to land balls on the table (control) and more forgiving on where you hit. For most players, the ease of use more than makes up for the slightly reduced lack of punch compared to smaller blades. If someone was very good and hoping to be a much higher level, they favor the smaller blades to get that increased sense of crispness. That's why of all the pro/high amateur blocker players you see, they do not use oversized equipment for the most part. Though this also depends on how they use their forehands.
Smaller/faster blades will generally have a more direct rebound, a straighter ball path for the same angle. Down side is the speed might be too fast for many blocks. Slower blades require more of a forward hit to gain the same type of ball.
Why do they sell slow blades with smaller heads, then? Lighter weight, still allows for slower speeds but with a slightly straighter rebound in my experience. Also, if it's small enough the sweet spot actually seems to increase. You have a smaller surface to hit, but that also means anywhere you contact the ball has a higher chance of feeling that SWEETNESS.
Certainly, someone could have a different opinion on this topic -- but they'd be wrong!
