Probably waxing, not only because I enjoy waxing, but the client gets instant gratification, it is cost effective, and the client comes on a regular basis, usually monthly. And when you make someone happy they don't want to go to anyone else. Loyalty and referrals, very nice.
With this type of service you can visit with your client.
LOL! So true, I second everything you said, and I'll add the following.
I am a goal oriented person and waxing fits into that, as, not only is there instant gratification for the client, I get instant gratification as well. Waxing is so straight forward, see hair, remove hair, hair gone, mission accomplished :) Out of all the waxing services, I would have to say that brows give me the greatest satisfaction, because you really can change, not only the way someone looks, but their outlook as well. Just yesterday I had a woman, who when I finished, looked into the mirror, literally giggled and said, "oh, my brows haven't looked this good in years! They are wonderful!" Then she practically skipped out of my room to enjoy the rest of her day. Brow's are a game changer. Who knew hair removal could be such a booster :)