The functionality of the 2 units is going to be the same. The difference is in being able to see more map to the sides.
Personally, I prefer the smaller size of the regular ONE as it's easier to slip in my pocket. I'd much prefer to see further ahead down the road. What's off to the sides is of less importance to me.
So my view is to stick with what you've got, and wait for some really major upgrade to come along.
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