Strictly speaking they are both MIA !
The Highway has a non-gloss (nitrocellulose I believe) but satin finish that isn't as strong as the American standard model. It is prone to more wear and will bash more easily, but some people will prefer this ! The nitro finish will lead to easier 'mojoing' of the bass.
And i've not heard many people have much good to say about the S-1 switching unfortunately.. sound wise there probably isn't a lot in it, so it's up to you really !
If it were me i'd go for the American standard because I wouldn't want the finish to wear too easily.