graeme_p - 7:19 am on Nov 22, 2010 (gmt 0)
You are making the wrong comparison or Solaris to Ubuntu, Solaris vs Linux.
I would say RHEL is probably the best for getting a job, and you can learn it using Centos (RHEL with the branding removed so its fre of charge). Debian is pretty popular two.
That said, the LAMP stack should run fine on Solaris: you can run it even on Windows.