I would also tend to disagree slightly with B2N2.
I think glass experience is becoming a more important thing when job hunting. How much it will help to have done your basic training in glass idk, but there are more and more jobs looking for x amount of hours EFIS time.
In my opinion though it is better to learn steam and transition to glass, because I think it's harder to go steam after learning on glass. The differences of opinion on this may suggest that this is purely a personal thing, but to me (learnt on steam)getting used to the glass basically consisted of saying 'oh that's cool/clever/easier' and getting used to navigating menus and submenus. I can imagine the other way around being 'that's stupid/user unfriendly'. Simple things like reverse sensing cdi's and auto-idents etc.. things that you can do on glass that won't cause you any problem but do the same on steam and it will.