call.. the 1/3 donk lead is usually a set or 2 pair. at least where i play weak draw leads are like a normal bet size, 1/2 - 2/3 pot. as played i would raise pre to .75-.85, flop im 4x ing weak leads at least, turn i bet 2/3 pot which makes SPR a little closer on river so its not such a huge decision for me.