I used cookie cutter exactly same builds, every point, champion point... EVERYTHING.

What stands out the most:

Max Magika was not the same: HE was higher
Magika Recover for some reason the Breton was higher
Health the HE was higher.

Now to the interesting part... I wanted to see if the champion system could even out the racials. For the main reason, there is 3,000 points difference in Spell Resist. Yes, 3,000.

For the Breton to increase through Champion Points Magic Damage 5% took 9 points... Also, Elemental Damage which the HE is based at 4% cost the Breton 8 points to receive 4.6% increase. So, just in Ele damage to equal the base High Elf took just 8 points.

The High Elf to match the Spell Resistance I added a unbelievable amount of 24 points to get 9.2% increase equalling 6477 total SR versus my Breton standing at 9138.

With that being said, the Breton will shine in the Champion System and easily make up the damage difference between the two, but most important the Breton can use the 24 points to increase even more damage reduction through the three trees leaving the High Elf scratching his head.

Just my take.....