Joe,
In general, I'd say that Oakmont's greens have more slope but that Mountain Ridge's greens have more contour.
While most of Mountain Ridge's greens have slope, some especially pronounced, like # 7, # 17 and # 18, they tend to be more tiered, with pronounced contour.
Earlier this summer I played Oakmont and my host and my caddy were suprised and commented that I putted their greens rather well.
I explained that that was because the greens at my club were faster.
When they asked, "what's your home club ?" and I replied, "Mountain Ridge", they replied, "Never heard of it."
I then said, "You will, it's a great 1929 Donald Ross, that's really, really a good test, but fun to play"
At the time I played Oakmont, Mountain Ridge's greens were faster.
And again, like Oakmont, that's for daily member play.
Sadly, many clubs are looking to flatten their greens, robbing them of their character, just to get their speeds up.
If Cliff Moore, the superintendent at Mountain Ridge can get their greens to 13 on Poa, why can't everyone else, if that's what they want to do, rather than mutilate the contouring and flatten the slopes ?