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I purchase the slotted ones. Without the slot any good brand case gauge is cheaper.
The benefit of the slot is helping to understand brass condition. I bought a bag of 7.62 LC pulldown brass that had the bullets pulled. They are (still) primed. My first sort was "can be loaded as is". These will be used with cast bullets and light loads. The next category is "need full length sizing - without decapping pin". Mostly these went out of round during the bullet pull.
The slotted gauge shows the shoulder and neck variations very well.
Do you need them? I did for the 7.62 brass I bought. But I also bought slotted gauges for other calibers. I personally think they are handy for trouble shooting brass sizing.
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