stlport v/s libstdc++

[Abhi]

At the risk of starting a religious war!

I have been wondering about the pros/cons of using stlport v/s libstdc++ 
with a gcc compiler 3.4 on FC2 (i.e. kernel 2.6.*)

- What are the performance implications? Are there any numbers/comparisons 
out there for some micro-benchmarks?

- I believe STLport has hashmaps v/s libstdc++ has them under extensions 
(last I checked). Are these any different?

- Issues with Memory allocators?

- portability issues? Which one is more portable (OS of interest: vxWorks, 
netbsd, FC2)

Essentially I need these details to determine if we will use STLport or 
libstdc++

Thanks
- Abhi