For me personally, Megs is much easier and quicker to use. It will clean and leave some protection behind without altering the look or feel of the interior. It leaves behind a factory new look which is important for me and my customers. 303 darkens the interior so it'll take a bit more to get complete and even coverage. I also dont see the need for a heavy UV protectant in the interior. Windows already filter out 99% of UV rays, and many cars have factory tint or added window tint. If its a convertible then I could see wanting a UV protectant, but Optimum is my go to product in that case. OPT smells a lot better and doesn't leave nearly as much of a shine as 303.
Whats your opinion of Megs vs 303?