I have used the neck bushing dies and prefer the LEE collet. Bushing dies, for me, varied the tension depending on the make of brass. Thinner brass necks equaled less tension and thicker increased tension. I don't want to neck turn all of my brass to get consistant neck tension on each case. I guess that I am too lazy to do it right, but the LEE collet works very well for me.

On that note, I also use a .303 British rod in the collet die as my boolits are sized to .312. Factory rod is used for jacketed, but was too small for the lead that I shoot in my .308.