Is this perhaps the best sporting rivalry ever? Due to the long period of time it's been running and the exceptionally high standard each set during that time year after year?
We've certainly been privileged to watch it in it's entirety. The best rivalries should always be strongly debated like this one. I just can't think of another sporting rivalry that has this longevity along with the crazy high standard consistently from each of them.
Many of the GOATS from the past were standing alone with no real equal at the time of their peaks, these two have been in direct competition with each other throughout their peaks in the game which in turn has extended those peaks imo.
In all honesty, the rivalry always felt a bit artificial to me. It's only really a rivalry on paper. At no point in time Cristiano was on Messi's level ever since the latter won his first Ballon D'Or. It was kept alive by stats sheets and team trophies which only distracted from the actual football both players played. The criteria applied to measure their "greatness" at times were so dumb and IMO it changed the perception of football for the worse because those superficial measuring sticks are suddenly applied to other player comparisons as well. You don't need to look any further than the Haaland vs Mbappe thread.