The LogoLites are a good choice for someone who wants a turn-key solution, everything included. The kit from Turnswitch.com assumes you're supplying the bulb and fixture yourself. I also like the design of the LogoLites signals and the fact that they position the lights close to where oncoming drivers will expect to see them. The lights will also be visible to drivers on the cross-street, which is not always the case for turn solutions that incorporate signals inside the headlamps.
I agree with Tacoma Bob that it's a pain for taller folks to get your arm around the wheel to operate the switch in the location they suggest. Turnswitch's steering column mounted toggle might be preferable there.
One thing the toggle does not do, which LogoLites does do, is hazard lights. I was really happy to have the hazard lights when my coupe broke down where the shoulder was narrow and I couldn't get fully off the road as I stopped.