Comparing the production Tami to the few proto pics of the SS isn't really fair on either. Until a SS production is in hand it's all speculation.
That said, I'm going for the SS as I prefer the weathered look (matches my favourite scenes in the entire saga) and the Tama just looks to clinical for me.
The only advice I would give at this point is, if you like clean, go Tama. If you like weathered, go SS.
I don't get too hung up on minor inaccuracies, but I do wonder that in this day and age why they can't get digital scans of certain items such as Stormtrooper helmets and C3PO's head and digitally scale those down to create the moulds instead of hand sculpting them. I know Vader is a bit harder because most of the original helmets are gone and the last remaining one in the Lucasfilm archives is in less than desirable condition. But even then, they did detailed scans for EFX so it can still be done.
I think that pretty much sums it up. Good post sir.