OI! WHO SAYS I SAY VO2x SLOW??
VO2x are my
fav DDs leh! Last time took it on 93 BC chiong bloody fast, then
see got plp flag bus then da brake, i nearly crash into the
windscreen arh. 
VO2x last time i take overtake a Mercs rigid (SMRT) and a bendy
bus, where got slow? In fact, VO2x is the fastest DDs i had ever
take (cant say abt B9TLs, since i haven't take it). Last time
chiong until dunno what was roaring. Voith is only slow when,
gearbox don downshift(like what i experienced on the VO2x when it
went up a slope) and always stick to highgear. Otherwise Voiths can
achieve remarkable speed, take the MKIII and VO2x as an example.
Voith on Habits also fast what. Just that i dont like Voith over ZF
is acceleration, cause i prefer acceleration over top speed. Abt
technical stuffs like reliability i cant say anyting abt it.

Infact it was the VSO that made me have a bad impression about
Voiths, since Voith made it even slower in acceleration, since it
was already underpowered. Also, you mentioned that i lived in SMRT
area (BP), so im more exposed to ZFs than Voiths, therefore its
natural that i prefer ZF over Voiths. 