I understand perfectly what the words "significantly ahead" mean. I used the term for 2012, when Utah was ahead by 23 places on Rivals, 18 places on Scout, .17 average stars on Rivals, and .08 average stars on Scout. Utah was ahead at every single measurement, I'd call that significantly ahead.
So 2010 is a draw, 2011 Utah wins huge, and 2012 Utah wins in all measurements, but part of that might just be class size (although Utah wins average stars that year, weakening some of your argument). True, if you use Scout, the gap is fairly narrow (working out to about two extra stars for Utah), but it's still Utah ahead.
And we can compare 2010 classes now, since they've had two years in the programs. Utah's is full of very good players. BYU's is still incomplete, thanks to missions, but I'd take Utah's:
Stars from Utah's 2010 list:
John Cullen. NFL FA, had offers from USC, Oklahoma, and a host of other schools.
VJ Fehoko. I know VJ is a sticking point for BYU fans, so let's go ahead and assume the 4* HS Army All-American sucks.
Terrell Reese. 4*, lots of BCS offers (ASU, Baylor, Colorado, ATM, Oklahoma St.)
Kenneth Scott. 4*, a couple of BCS offers (colorado, MSU) but committed to Utah early.
Dres Anderson. 3*, very good WR as has been shown by his play.
Brian Blechen. 3*, and ignoring his suspension for right now, he's a freshman all-american and honorable-mention all pac-12 last year.
Joe Kruger. 3*, starting DE the past few years. Certainly has lived up to Utah's expectations.
Stars from BYU's 2010 list:
Ross Apo. 4*, not a ton of catches but looking like he might have a good year this year.
Jake Heaps. 4*, disaster at BYU.
Josh Quezada. 3*, transferring for whatever reason (although looked fairly promising).
Now I don't know BYU's roster as well as I know Utah's, so I'm sure I'm missing some stars, and of course it's early for a BYU class (or any class, actually, as most players would have been RS freshmen last year) but looking at the two classes, I like what we got out of Utah's 2010 class quite a bit, and I'd certainly take it over BYU's.