well All above said very well and justifies that non of them can be compared or differentiate in many cases
but what for we all are here the main target is the "Users"

and as far as i have noticed the current "Users" are more tech. filtered compare to past time so what i felt is that as per "need of change" the " user" get diverted what can satisfy it.. which probably some extend GOOGLE does wether search engine or mailing , or business wise .

So somewhere End user wise Google Rules- dat's what i feel

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