Which system of measurement is best for paper crafts?
I’ve heard agate.. and my cousin swears on metric. Thought I’d see if there was any truth to either. 
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It doesn’t matter as long as everything is in proportion and you use the same unit everywhere
Personally i would use metric because Cm are smaller that Inches and therefore more precise
Ps: Also there are mms(millimeters) which are even smaller
Metric is more precise, than imperial(inches) but so long as you are consistent with what you use and are happy with the results either is fine. The idea is to enjoy crafting and the end product not to get stressed about it.
Because there are patterns and projects around in both imperial and metric, I use both
I bought a good metal ruler with both types of measurement on it so I can just flip to the side I want. I did buy a Scor-Pal in metric as I love in a country with metric measurements, but I find it easy to use either.
Just be consistent with your measuring and all will be well
Most paper or card stock sold in the USA is measured in inches (imperial measurements).
Agate is usually what newspapers use to measure ad space.
I have never heard of Agate being used in card making and I have been a card maker for decades.
Metric is much more accurate and can be used with the USA imperial measurements.
I love my metal ruler with the cork backing (to prevent slipping) that has both imperial and metric on either side on the ruler front.
When measuring, always use one type (imperial or metric) of measurement for all the same project.