Smallblock Pistons: 1 question.....KB's -or- Sealed Power(SpeedPro hypers)???

I prefer Speed Pro over the KB... I bought an engine from someone that had KB's in it and when we took it apart and put it back together one of the piston skirts chipped off... We didn't drop it or bang it, it just fell off when we were handling it to put it back in... Not sure if it was already cracked before we got it, but I went with Sealed Power/Speed Pro as they have a much thicker skirt....