It's a pretty even split actually. Kinwald, Truhe, and many of the Losi guys that race on tight indoor tracks use the 2" blue springs up front, because the setup that goes along with it gives the truck more steering.
I feel more comfortable running this setup for a couple different reasons, but a lot of it is that many big races don't have constant 180 after 180 like some tracks like SoCal have, and this setup is very easy to drive smoothly through flowing turns.