>>1228397haven't driven a UK bus so I can't say
however I was talking to a driver from Ontario where they have some Alexander Dennis Enviro500, (same one that ran into a train in Ottawa). From what I hear those things were outright unsafe on our roads.
For American buses I have only driven GMC New Looks and MCI Classics which were great buses, and an Eldorado which was ok to drive but broke down a lot.
for Canadian Busses, New Flyers are shit because of the mouth breathers in Winnipeg who build them. Nova Buses are great, they are built in Quebec and owned by Volvo. Orion buses were a lot like the New Flyers but built better.