I am going to disagree with the smaller is better opinions.
I think large attention getting scopes are best for the public. They show objects the way they should be seen and in a way no smaller telescope can.
For over 20 years a hauled the 9" refractor to hundreds of star parties. A 9" refractor on a GEM has a presence, it is a draw. Many of our star parties were cunducted on grocery store parking lots. Passerbys notice a big telescope, that looks like a telescope, when it stick 14 feet into the air. It gets their attention, and then delivers.
-------------------- Siegfried
4" Mak
160mm F8 TEC (born 1-18-2007, 27 lbs, 45.5" long), on AP900
150mm F17.5 (D&G lens) (first light 6-7-2008)
9" F/14.8 Alvan Clark (1915), on Byers 812
14.25 F/5.5 Newt in a roll off observatory
Others, that have come and gone