Both at once.

TODR the other day mentioned that he has been flying an ASK-21 glider. Like many modern two-seat gliders the ASK-21 normally has both a nose wheel and a tail wheel and a main gear. I'm not sure about the 21 but a lot of these two seaters can use all three wheels on one flight, depending on loading. http://en.wikipedia.org/wiki/Schleicher_ASK_21

My dorky little PW-5 has a main gear, nose wheel, tail wheel, left tip wheel and right tip wheel, for a total of five. Got the bases pretty much covered.
 
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All corners covered...

....
My dorky little PW-5 has a main gear, nose wheel, tail wheel, left tip wheel and right tip wheel, for a total of five. Got the bases pretty much covered.

...and if you don't balance correctly on the big one, you always have a wheel to fall on, no matter which end of the glider drops....:)

gil A - with a Mini-Nimbus with only two wheels (and I had to add the tail wheel...:)...) -- skids on the tips, and an expensive fiberglas repair if you use the nose...