The dcrainmaker reviews are a great resource and if he doesn't cover it, it's not worth worrying about.
Seems like the touring versions have a few more navigation options that allow route generation and navigating between points on the fly. Touring plus is ant+ capable, standard touring is not.
Full side by side comparison of Garmin Touring vs Garmin Touring Plus vs 800 vs 810: http://www.dcrainmaker.com/2013/08/garmin-touring-computer.html#comparison-to-other-garmin-edge-units
The dcrainmaker reviews are a great resource and if he doesn't cover it, it's not worth worrying about.
Seems like the touring versions have a few more navigation options that allow route generation and navigating between points on the fly. Touring plus is ant+ capable, standard touring is not.