159s are probably my favourite, probably because I travel on them the most. I like the 444s as trains but started feeling a bit ill last time I was on one for some reason, I rarely feel travel sick. The 450 didn't make me feel ill but I just find it less interesting. I've never travelled on 455s, where do they usually operate to/from?
I didn't feel too well last time on a 444 either, although that was a 110 minute journey and I was sitting at the end of a coach (didn't believe it when comments on here suggested sitting away from the bogies, which are at the end of coaches, have a smoother ride. But I think in many cases that is true).
The 455s do majority of London and surrounding area local services. Almost all stopping services via Wimbledon, so to/from Guildford, Woking, Hampton Court, Chessington South, Dorking, Shepperton and "Kingston Loop" are run by 455. Also on weekends majority of services via Hounslow and sometimes a small number of Windsor services. If you do bash one then sit in a motor coach, one of the two intermediate coaches (easiest way to find it is by looking at the 5-digit coach number, if it begins with a 62 then it is the motor coach).
The 455s are my favourite because of the sound, bit annoying there are few fast services run by them, best one is 1J91 1923 Waterloo to Surbiton
