I voted for the longer two as well.
Of course, there is a danger that the newer, less experienced (less fit ??

) riders might get 'scared off' by those of us who have been around the block a bit (on our bikes of course, so we should be fitter, yes ?

) and we could end up with the CC Forum rides becoming more of a 'club run'* (ie more serious riding) than a social, cameraderie-based tootle around. Obviously, a wee bit of a challenge is A Good Thing. On this basis, the Trossachs run - a bit longer but no 'last Sunday' hills

- might fit the bill better.
As a principle, how long do we want our rides to be ? I would suggest 50km/30m as a good starting point - long enough to take some time, short enough not to need beard, sandals etc (attempt at an audax reference there

). A mid-ride (lunch) break would be good, preferably with more than lovely views of battleship/castle to eat !
* I should add that I am not a member of any club, nor have I taken part in any club run but I have my impressions .....