Used to use So-do tan (about 10 years ago) and was happy with it, but now changed to Sienna X as I found it had a few more options re %. Not sure what sudo offer now, but more than happy with Sienna. Always try new and different tanning solutions, but stay with sienna.
It's your business, so try all and every tan you can, and choose the right one for you. I find the difference not in the way the tan applies and looks, but in the way it wears off.