Return or double slap on delta Ambipom

I have a delta Ambipom with technician, and I believe it has max happiness (otherwise it will soon) so what move should I have, return or double slap?

Return, Double Slap is too reliant on randomness.

Return, because no matter what (at max friendship) it will have over 100 base power, whereas Technician boosted Double Slap only has a 1/5 chance to have over 100 base power