I prefer covering hinges.

Here's my technique. I bevel the control surface and tape it into place on the opposite side from what I'm covering. I then cover the main part of the wing and bend the aileron 90 degrees and iron into the hinge gap and then continue ironing over the control surface. I do it with 1 piece of covering over both the flying surface and the control surface. I then flip it over, remove the tape and do the other side. On larger planes I use conventional hinges and then a covering hinge over top.

Here's a picture showing what it looks like when done.

Clockwise from the top left: Sig Kougar elevator with CA hinges, .46 size Pitts ailerons with Du-Bro hinges, 1/2A Ultimate tail with Ultracote covering hinges, .15 size Sopwith Pup Aileron with a Solartex covering hinge.