Which smartphone for development?

Hi,

What mobile platform would be best for a Ruby developer interested in
create
some mobile applications for their own mobile phone?

I’m still trying to understand which platform is easier to develop on,
Symbianor Microsoft Mobile? One disadvantage for the Windows Mobile
platform
it seems is you have to spend hundreds of $$ for the Visual Studio
Professional edition. Any comments/recommendations re this would be
appreciated…i.e. which platform should I target? or should it really
not
matter if we are dealing with J2ME anyway (i.e. cross platform)…

BTW: The phones I’ve got down so far to consider, for Australia (no
iPhone
available) =>

*** Symbian ***

*** Windows Mobile ***

Tks
Greg