The Hornady set is universal, and you can cheaply add the set of bullet comparators too.
The nice thing about the Hornady (also the RCBS Precision Mic) is that you're making a measurement, so if you ever have to make ammo for a weird chamber, you can do it.
I'll give you an example:
I have two rifles chambered in 7mm Remington Magnum - a Savage 111 Hunter and a T/C Contender. The shoulder on the fired brass from the Savage is a full 0.020" longer than the cases that come out of the Contender (which is closer to factory ammo). If I used a gage, I'd be loading everything short enough to fit the Contender, and unecessarily stretching the crap out of my cases in the Savage. Instead, I can use the Hornady head space comparator to measure the Savage brass and set the sizing die to only push the shoulder back 0.002" to 0.003". Those rounds will be too long for the T/C, but they won't stretch in the Savage.