Based on the video, it should take 3:20 to make 5000 RP. That means it'd earn 90k RP in an hour.
Since Criminal Records now earns you 5000 RP per race, which one is faster comes down to whether or not it takes you less than 3:20 to go from the start of one race to the start of the next race.
When you have someone cooperating with you that can actually finish the race, it seems Criminal Records would be far faster. There's no way it should ever take more than 2 minutes to complete a CR race, voting and loading and all.
Plus, CR also pays out decently and you get race wins and part unlocks on top of that. Not to mention it's more fun.
This could potentially be useful to someone looking to bust out some RP after CR's RP reward gets patched, assuming that ever happens.