It depends on the situation.
If Goku didnt have the heart problem he most likely would have mauled 19, he used kamehameha as a last resort thing since he was running out of steam cause of his sickness.
Picollo also treated 20 like a b1tch and chopped his arm off with a casual swing.
I bet Trunks could phuck up old bucket hat with his sword...
If they can use the absorption technique without notice they could pull it off otherwise they get beaten bad.