On the R ships you seem to meet the same people on the cruise more often
Sometimes on the larger ships you may not see the same people again on the same sailing
We like both as said above we go for the itinerary
both size ships it will depend on your ship mate whether you can get extra reservations or not
E ships have only 2 Specialty restaurants ..no La Reserve or Privee for extra dining options
some do not like the smaller cabins A to G along the smaller W/C that goes with that option
We do not mind
YMMV