Which OS is better for Hobbit server ?

Solaris 10 sparc/intel  or linux ?

Not trying to start arguments, Just want to understand how others making 
their decisions ?

For me, I think Solaris 10 has following technical advantages over linux(RH) 
camp
1. Dtrace to help on problem finding.
2. Faster TCP/IP stack(rewrote and improved in Solaris 10).
3. Very rock solid stable.
4. Commercial support avaiable from Sun if needed.
5. Solarish has no  OS seat-license(RH Linux has it).

Thanks for your time

T.J. Yang