Yup I do agree with the parking woes and the countless cons
bendies bring about to SMRT. But travel wise, I would still
prefer bendy over DD because of similarly shorter travelling time.
In Singapore we are always in a hurry to get to places and that to
me is accounts for efficency as well. As the common army
saying goes, 'Where got time?'
Just my two cents worth.
Hmm quite agreed~ Bendy bus can speed and turn at curvey roads
easily, but DD can't due to the safety. But overall, I still think
SD or even MRT's the best. No extra "weight" for SD, and fixed
timing for MRT 
But on the other hand, I think DD have a higher chance of
allowing people to eat in bus? :x