Vee-tail when used for turning and elevons are the same in function.
When I have a plane without ailerons, and no ground steering needed, I use the elevon function for the vee-tail controls, turning on the right stick.
When I have a vee-tailed plane which takes off from the ground, I use the v-tail function on the rudder-vators which use channels 2 and 4, 2 for elevator on the right stick, 4 for turning on the left stick, with a seperate servo or hookup for the ground steering on channel 4, and the 1->4 MIX to get the right stick for the turning function in the air.
Most 6-channel radios provide all 3; elevon, v-tail and 1->4 MIX.