If I had a tag I would want at least 43 foot. You do loose storage space with a tag, but the longer chassis gives back the storage.
Both were on my short list, but Tiffin had the edge. The cabinets were deeper which my DW loved. In driving both there was not a huge difference between comfort steer and Tiffin steering IMO.
Both are fine rigs and you will not go wrong with either. Find the floor plan your DW likes better and jump on it.
FMCA #F431170, GS #822128658, Escapees SKP #112655
2012 Airstream Mercedes Interstate Class B