I agree with your assessment for friends' Alaska vacation. I also think dining together will be easier to arrange on Solstice.
We actually have enjoyed E Class.. we find the experience livelier, with super shows, more dining choices, great art. We have been on EDGE ( 2x.. once in AQ Class% IV, and once SV with the 4 mdrs). Most recently we did BEYOND (Retreat). Booked on ASCENT and APEX.
We have enjoyed Silho and EQ too and will probably try Connie once again b/c she sails from Tampa..Our fav ship was Mercury so we are not youngins!