Which gets less blur handheld at 70mm?

Thanks, all, for your help and suggestions.

I tested the room yesterday.  Shooting the 24-70 at 3200 ISO on my D700 I was getting shutter speeds of 1/10th to 1/20th at 70mm.  Sometimes my hands are steady enough for that; sometimes not.  I can take as many pics as I like w/o flash but with flash people will go crazy.

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Sean