How about both? Gotta do one out of reverence for Strava and their decision to host the challenge globally and gotta do the other out of patriotism, US ranking.  See, this might not be a real hard decision for anyone with a 15 mile commute.  I have to go 45 miles one way.   Notice I didn’t say kilometers.  I did it in 2:42 last year but only once, the global challenge.  This year I suppose I’ll do both because I’m not sure which is official?  Should we get the UCI and USA Cycling involved?  It can’t get anymore convoluted.