I completely agree with you. Just wanted to point out. Anyway the lower the better:p
Unless you play competitive FPS seriously (CS Go for example) it's not something that matters and unlikely something you will actually be able to physically notice anyway. Also keep in mind they only advertise grey-to-grey times, realistic delays will be nothing like that for both panels so don't ever use it as a reliable reference.
I tried the IPS version, terrible orange glow in the corners like all 27" 1440p high refresh IPS screens. I have the TN version instead, which I got for £400 on Amazon warehouse and have been very happy with it.
Ips version has 4ms delay time though