Scouts vs. Rivals

So which scouting service is generally more accurate in ranking recruits? I was looking at TCUs commits on rivals and they are ranked absurdly high. Scout.com has there commits ranked much much lower.
for example:
Four star - Waymon James #14th RB in the country on Rivals (#175 RB and a 2 star on Scout)
Just thought it was weird that there was HUGE discrepancies between the two.
for example:
Four star - Waymon James #14th RB in the country on Rivals (#175 RB and a 2 star on Scout)
Just thought it was weird that there was HUGE discrepancies between the two.