For 2K less I would go with a deere, but have never had the pricing fall that way for us.
I have a Lazer Z 60 with a Kawasaki and a Dixon 60 with a Kohler.
I went Kawasaki after a couple of back to back Kohler problems. (warranty issues)
I think the pricing between the Kawa and the Kohler may be the Kohler is coming with the improved air filtration set up and the EFI.
If I had to buy a mower tomorrow, it would be an Exmark (not as happy with the current dealer, then again have not needed them much) or the Hustler with Flex forks which gives you some front suspension and I have a good dealer close.
I would also be tempted by a Bad Boy that we saw at TSC for substantially less then either.
I think either of the choices you are looking at are a great piece of equipment. For us, parts availability is one of the most important things, and I have to think Deere is pretty excellent (although again, my experience has been pricy)