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Any of them will do. Since you will, almost inevitably, damage your first strop, I would go for the Natural. There is a review of all of SRD's strops available from here: Straight Razor Magazine:...

Because the SRD strop offers better handling, is better made, and allows for the easy replacement of damaged or otherwise unwanted strips of leather, wool, or cotton. Ie it offers much better value...

Yes, natural, of course. I find the latigo the least desirable of the SRD strops. English bridle, Horsehide (I don't think that one's available any more), Naked. In that order. The rest are nice, but...

It has indeed. It is also a cheap and flimsy piece of equipment which I personally feel not worth having. Just like anything sold by Star Shaving, just for the record.

Straight Razor Magazine:...