Fluid - it stretches with the browser. Radio buttons: the little round things, for example when you select whether you want it to detect mobile devices and such.
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fluid is obv best then
I've always preferred fixed but do whatever doesnt make a difference to me really :P
I think it depends on most peoples browser.
If you have a widescreen monitor like myself, then fluid is a little bit too big.
The option for both wouldn't hurt anybody though.