I use linear polarizers most of the times. In my experience they introduce less colour artifacts. The need in circular ones IMHO is overstated by marketing (the FUD thing).
I can see a reduction in the reflections on the leaves in the crossed polariser version, but that reduction is what I would expect to see with normal polariser use.
How was your 'normal' shot taken, a polariser on the lens but unpolarised lighting, might explain my confusion.
When I use crossed polarisers it's to get very different effects like this: stressed stencil by Mike Kanssen, on Flickr
I prefer the first picture: even though still, it has much more life in it.
I have given up using polarizers, because I have started using wider angle lenses. But I must see if I still have linear varieties that will fit my current lenses and re-evaluate them.
Great demonstration! As I've mentioned in another thread, having a gallery with a kind of before/after or A/B slider would be a great thing to have for things like that...
I feel like in some situations it's great to have a couple of versions like that so you can create different blends afterwards. I would probably go with something like this:
The great thing about doing that after the fact, is that you can apply/limit a certain look to certain parts. I have a polarizer somewhere but not used it in ages. Need to go look for it though - it certainly can be a very effective tool.
I like that the specular highlights are removed, but the colors seem overly subdued. I'm thinking some PP would restore the color and result in the best of both worlds.