First ,cut the tip of the nozzle

I usually recommend transparent silicon. It generally covers any minor errors and gives the finished job that professional look. Run the silicon along the edge of the sheet vinyl and the wall. Then lick your finger and run over. This changes the profile of the silicon layer frrom a rounded fill to concave fill.

(Perfect)
In the case of our Toilet, shower and Laundry area
WHITE would be excellent. It would cover the dark cement grout beautifully.