Which model Challenger SXT, R/T or SRT is the most reliable/troublefree?

[Vanishing Point 440]

Which model/ setup would give the most comfortable ride over real roads that are ill maintained?

[Jesus H Chrysler]

I can tell you from experience that the SRT and R/T with Super Track Pack have firmer suspension and are more harsh on bad roads.  I cant tell you the difference between standard R/T and SXT.