Never owned the Saw Blade, but my understanding is that it is a more aggressive ball than the Sharp Blade.
I did own a Sharp Blade and currently throw the Sling Blade. The Sharp Blade did exactly as it was advertised: it rolled in the mid-lane and was very, very controllable. Plus it hit well. But, I agree with you, it isn't good in the dry: hook, set, and quit.
I have a Sling Blade drilled weak and it is my "go to" ball when the lanes are drying and I need something to get down the lane. Not good on completely fried lanes but on tougher conditions and late shifts in tournaments, it is my ball.
Hope this helps.
Scott