Embedded Linux vs Windows CE

I just read a thread on Linux vs Windows. I am wondering what the choice would be for embedded environments. While Symbian takes a large share of the market, if the choice were down to embedded Linux vs Win CE, would would it be?

Specifically, what is the difference in deployment costs (end user license). – Specifically Montevista version of Linux.

Ease of development – Win CE offers Platform builder. What about embedded Linux ?

Language of choice. How easy/difficult is C++ for Linux? Is c++ code developed on Win CE portable to embedded Linux?

So guess my question really is two part – comparing the two embedded OS, and portability from win ce to embedded linux.

What do you think?