I haven't got much experience with owning lots of bikes, but just from having tried a few I prefer two cylinder engines for normal road bikes, in V and flat. I really like how a boxer is both smooth and torquey at low and medium rpms but also sounds great at full throttle in higher rpms. I used to like my Transalp 650, it was happy being revved but felt and sounded like it would last forever, if that is even possible to get from the sound at tickover , still love the distinct smooth sound an old Africa Twin or a Varadero makes.