I usually use one as a starting clamp, then comeback after tying off the last cross to tie off the first cross. Bascially one is use just for starting crosses only, the other is for bridging, pulling knots, etc.
Eagnas used to sell thier starting clamps for $16, now it's $26. Gamma is the weaks clamp of the bunch for $40, Alpha is $34.50, GSS sells one for $40,and Babolat sell thiers for $58. My Gamma clamp came with my machine.
Machines: Gamma 6004 2-point w/ Wise 2086 & Babolat Sensor Dual