The new wider cassette, gains you more gear range, than the slightly more narrow triple, loses range. And with 16T max drop on most front derailleurs now, you can go wider still, or go 11-36T and get by with a 50/34 or 52/36 wide double.

Each tooth at the high end of the cassette, makes way more difference than at any of the chainrings. And on 20" wheels like my folder, that 11T makes all the difference in the world in having a sufficient high, without needing an internal gear hub for an overdrive.