After reviewing all the responses the one thing that is clear is that there is no consensus as far as a BEST
solution . It would be soooo much easier if there was but I guess it depends on so many factors.
Being in Canada and not wanting to deal with added shipping costs my choices were more limited. I also wanted to be able to pick-up product if necessary so that definitely narrowed the field.
I've only tried a hand-full of professional solutions. I have found the Norvell One great but for many who wanted a darker colour were disappointed that it did not get deep enough the same applies for the Aviva express solutions.
Personally the fade on the Norvell Venetian and the Aviva 12% for a fair person (especially) was not even and I received feedback from even those with darker skin tones that the colour looked great initially but faded quickly and was uneven. So I am still searching for a darker
solution that wears well.
Time to see what new products are available closer to home.