Personally, I think this thread's really limited to US.

Because all you people saying RITD (amazing song don't get me wrong) is nothing compared to SLY in the UK. So if I took it the way you guys look at it, then for me out of those options being British SLY is the biggest song of the decade with no doubt. It's hugely massive here compared to RITD which didn't hit number 1.

That's why I ended up voting for GS since it proves to be a bigger song to everyone because a billion views on YT don't lie.