The level 65 set is a trap. You can buy them for gil from a vendor in the level 65+ sections of Stormblood zones. I wouldn't waste your red scrips on them unless 200k gil sounds rough to your wallet for a set of gathering gear or you somehow have all of the SB folklore already.

As for what's better, I have no clue. Just do the math. Generally speaking, your Gathering and Perception will either both increase in total or both decrease. If they'll both increase AND you won't fall below 600 GP, it's worth it. Else, it's not.