The general development speaks in their favour. Give me something tangible, something statistical, something undeniable - that's more, literally, impressive than anything which hurts your brain a bit.
Well, possibly. I have a hope, though, that football will still be regarded beyond the stats. It's always been a part of its historical reception, so to speak - people who care about football history have never been obsessed with stats and pure goal scorers have never been acknowledged as anything more than just that by those who give a feck. Hopefully that will remain true.
That said, both Ronaldo and Messi go beyond the goals netted, both in terms of actual quality and media exposure - and what should ensure their positions in history, if nothing else, is precisely their immense exposure in a time where that exposure is greater than anything we've seen, and to a great extent (as per the story told by the media) focused on their "rivalry". That alone counts for a lot in terms of how they will be viewed, if history has taught us anything.