Little bit weaker, little bit lighter, little bit faster.
Typical cross country wheelset might weigh 1600 grams for the pair.
Subtract 4 spokes each (6 grams x 4 less x 2 wheels) and 4 nipples each ( 1 gram X 4 less x 2 wheels) and you'll save yourself 56 grams. Or 0.12 pounds.
With a 36-spoked wheel, it's that little bit safer to use aluminum nipples and you can go to a lighter gauge of spoke, if you're brave. These things allow you to build a wheel that's the same weight as a 32-spoke with more even stress distribution.
It's splitting hairs, really, I just wanted to point out that 36-spoked wheels don't have to equate to heavier or stronger wheels.
Yah I usually run 32 in the front and 36 in the back.
That's a great combination and it's what I run on the only wheelset that I got to spec piece-by-piece. You can even take it a step further by running burlier spokes on the rear drive-side.