Vax Steam Mop - which one of these two should I buy?

[MrsBakedBean]

S85 CM for £50

www.vax.co.uk/steam-cleaners/steam-clean-multi

or

S84 PIB for £60

www.johnlewis.com/vax-s84-p1-b-switch-steam-cleaner/p2869276

and why don't VAX sell the John Lewis ones. What is going on.

Thanks

I know it's a really boring question but I have never had a steam cleaner before and I'm a bit confused.