A 12-27 or 12-28 gives a better ratios as it will give another gear in the middle even a 48x12 is a good high gear for most situations.
True enough. I just wanted both the 11 and the 28 for enjoying the descents as well as the climbs. I enjoy descending fast!
My new bike is an 11 speed 11-28 setup and that extra gear does make a difference, as you say. Once I am ready, when it comes to replacement time, I hope to drop to 11-25.