Thank you.
A couple of options depending on what you're after really;
If you want a "pure" shampoo that doesn't add and protection/wax/gloss enhancers then for it comes down to either Gyeon Bathe or Car Chem 1900:1 (well, personally I'd spend the extra £1 and get that personalised. ).
If you're after something that adds protection and gloss, you simply won't find better than Gyeon Bathe+.
In short, none.
I'm not really a fan of spray waxes to be honest as I don't find them to be at all durable. For no extra effort you can you can apply just about any acrylic spray sealant or for less effort you can apply Gyeon WetCoat for better protection with similar durability.
For me, the only advantage to wax over a sealant is the difference in finish, but I've never got the same deep, wet look from a spray wax as I do from a paste wax so if I was going for spray on/buff off LSP then I'd opt for a sealant and AM Seal would be my choice.
If, however, you just want something quick and easy then I'd recommend what I'm going to deem "the Gyeon regime"; I.e. Bathe+ and WetCoat, applied alternatively once a month (after an initial coat of both for month 1, Bathe+ month 2, WetCoat month 3, repeat) with a pure shampoo for the other washes.