Clamps, most definitely!
Bessey K-Body clamp 
The K-Body by Bessey is really nice because the clamping surfaces are large, flat and are parallel. The K-Body is perfect for clamping panels at right angles.
Rockler's "Sure-foot" pipe clamp 
The "Sure-foot" has features like a broader base that doubles as a hanger when storing the clamp. I also sprung for the zinc plated pipes because the black oxide used on regular Home Depot type pipes react to woods like oak, leaving a black mark. Plus, they look good.
I also have the clamp pads and Rockler's brand new EZ-Clutch that aids in removing the clamps.
You don't need tricked out pipe clamps like mine to have the same results. Order up some inexpensive pipe clamps from Harbor Freight and go to Home Depot or Lowes to get your pipe. That'll serve you well.
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Jim
Houston, TX