I would say that you did not need to do the second application with Sonax, and the second application of Griots still did not remove as much as the first with Sonax.
So,
1. You need twice as much Griots to get almost as clean as Sonax
2. You have to buy a separate bottle to even use the 16.99 griots, unless you just buy the $3.99 sprayer and lug around a half gallon bottle sprayer.
3. You need to live down the street from Griots to put them in the lead
(kidding, but couldn't resist)
I've tried both, think Sonax is much better, obviously YMMV. I even have a half used bottle of Griots that has been left to get dusty in the wake of Sonax.