Thank you. I am also about to install gutter lights and debating about using the conduit method direct to the gutter, or nailing the lights to the eaves directly behind the facia.
If you plan to mount something permanent then it may be wise to invest in something like the Aluminium diffused channel as this will look the part and not look like some tacked on addition. It will cost more but it will be done right and look great all year around even when the lights are off during the day