In my opinion, what makes a better E&M text really depends on what you want to learn from a course in E&M.
Do you want to solve boundary value problems for (say) a particle detector or a waveguide?
Do you want to determine trajectories of charged particles?
Do you want to learn about electrodynamic effects in matter?
Do you want to learn a relativistic field theory?
etc...
Maybe a little bit of each?
Other intermediate/advanced "E&M texts" (other than Griffiths) might include Landau/Lifshitz, Ohanian, Lorrain/Corson.
An interesting text is by Ingarden/Jamiolkowski.
On a side note... will E&M texts ever emphasize more differential-forms and tensors, rather than just standard vector calculus? Certainly, there must have been an earlier "standard" text that didn't use vector calculus, and was eventually replaced by one that used "more modern methods".