It doesn't matter.. ability to get into a higher school is a euphemism for LSAT/GPA.
A study showed that only about 15% of LS success (grades) can be accounted for by LSAT/GPA. It was cited in the 2004 bcguide (PDF)
, if you want to look it up. The other 85% is probably due to hard work, and good LS exam writing ability (not tested by LSAT or UGPA).
So, it's irrational to assume that it would be easier to be at the top of your class at a worse school. In fact it's probably harder because there is more pressure for EVERYONE to work hard, because if they don't finish at the top, they sleep in the park.