I tried to search for comments/opinions on the best smelling products when applied to the interior but my searches kept locking up and gave no feedback.
i really like the smell of 1Z cockpit premium, and several customers have made favorable remarks about it afterwards. it's not overwhelming yet smells nice
OPP has to be one of the best products i've tried. You can basically apply it to everything. It darkens the leather in my GL and leaves a matte finish. Smells like... coconuts.
I like Meg's QID. It has a light smell. In my first use of OPP, it had the smell of fake leather (musty) compared to my Four Star Leather Conditioner that has a lighter smell. I think Mothers has a very unique smell although it is interesting to see PB's smell like bubble gum.