Either plane is fine. Boeing vs Airbus is a religious war for some, but it is just a tool. Each has their advantages. The airbus is definately a nicer working environment. The Air Con actually works and you are not stuffed into what was the cockpit designed in the 50's for the KC 135. ( Yes that is the 707 nose still). The lack of air con that works may not be a factor in the UK but other places it certainly is. You can handfly either plane and have a good time. Boeing more pleasant in a crosswind or an upset would be better. FMC and mode control panel better in the Boeing. Table damn nice to eat on in the Bus. Bus is quieter and more comfortable.
The best choice? Fly whichever gets you the best schedule, layovers and the most time off.