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Bearing in mind tha box calf is the leather that can be restored best by Hermes, I would say take the box calf. As it also gets a beautiful patina.
But it's difficult to decide without having seen the bags.
The thing is: obviously neither of these bags 'sang' to you. You didn't fall in love. Given the fact that you're still very new to Hermes - why don't you wait a bit and wait for the one that truly makes your heart sing? That will be the one. These are very expensive bags and buying one is not something that one should rush into, just to own one. You want to carry this bag for the next 20 years or so, possibly even longer. So take your time.
I doubt it, the SA said I was really lucky there were even 3 availible. The 3rd one was 28cm, Tundra, box calf... but I just found the size too small for me.