These conversations about the 270 vs 280 have been raging on for ...oh....maybe since the 1970's (?),or at least that's when I became aware..
I never participated having rifles chambered for both, but finally grew weary of 280 lectures at the LGS, and said "piss on it" and bought a 7Rem Mag, leaving them both firmly in the dust.
I concluded it didn't matter which of the other two I owned because there was nothing I could do with a 280 that I couldn't do with a 270.....I was right on both counts.
When I joined the CF I was not surprised to see the same silly arguments going on.Might be one of the biggest wastes of grey matter in the rifle shooting world...especially today.