I own a bus with a semi-auto gearbox that's 33 ft long, and a pre-selector gearbox decker that's 27 ft long. I also drive a very wide variety of other buses via my involvement at the Museum of Transport Greater Manchester. I get asked this question a lot and my answer is "in general, neither - the word I'd use is 'different'". You get used to the size and driving technical needs (double declutching, pre-selector gear changes) very quickly. A few weeks ago I was at a MoTGM event and went straight from a Daimler Fleetline to a Guy Arab, each with a load of passengers. The main difference isn't the difficulty, it's how tired they make you. I can drive my Bristol RE all day and get out of the cab fresh as a daisy - the engine is 30 feet away, my left foot never even gets used, light steering. But a PD3 with synchromesh on third and fourth only, a heavy clutch pedal, 9.8 litres of loud next to your left knee, draughty opening windscreen, a cab climb that Sherpa Tensing might baulk at... eight hours of that leaves you like a wrung-out rag.
Anyway, back on topic, my myth: it's perfectly okay to race into the traffic gap just in front of that bus as 'he's only slow'.