Which London bus tour is the best?

The famous bus tour of London is a must, but which bus to choose for the best tour of London? Here are some of them

Big Bus, Original tour & Golden tours:
The similarity of these tours is that they offer much the same thing — a tour of London’s main landmarks with a total of over 40 stops in an open-top bus followed by a river cruise and walking tour. On board these buses you’ll find free…