Wilga needed a good tug pilot - it was easy to climb faster than the space shuttle but it gave a speed of 45-50kts down the back end. Which isn't fun in a heavy open class machine - somewhat akin to a fat bloke walking a tightrope.
Pawnee is hard to beat - a good mix of speed and climb rate, and nigh on indestructable.
Worst tow ever was an ASH behind an original chipmunk. Walking would have been quicker.