As I have stated many times here, from personal experience I know that theTrek warranty is actually very good indeed , don’t really know where you may have heard differently?
I have a 5 and a Trek EX9, each are excellent bikes but with very different ‘characters’. The Trek gets used for events as it is an excellent compromise between climbing ability, fun downhill and general ‘chuckability’. The 5 I have is used for days out at trail centres and in the Alps and when I want a laugh, not quite so good uphill, mostly because it weighs a few pounds more, but is a grin machine everywhere else.
Have you actually tried either?