I really like T5 as I think it performs strongly on almost all criteria that you're looking for in an airport terminal (with the notable exception of the shopping options which only really hit the mark if you're a multi-millionaire). HKG T1 and the SIN terminals are also much loved by me in some regards, but I find them to be significantly worse in others - particularly with regards to the security arrangements (SIN T1, 2 and 3, and HKG), immigration and emigration experience (HKG and increasingly SIN), and the distances you have to travel to get to the gates (HKG and sometimes SIN).