I like pretty much both liveries. I haven't really been on a 357, though I've seen them on YouTube and from DLR Stations.
I've been on:
DMUs
Class 170, 153, 156, 171
EMUs
Class 317, 315, 321, 377, 455
Other
Mk3 coach hauled by Class 90
Services I've been on:
NXEA, CrossCountry and...