Yes, not sure about the Dash 8 but the ATR is well known to be a more complicated type rating to obtain compared to other popular types (737, 320 series etc). However after having operated the above types over 15 years as a TRI I can tell you, it`s all the same s%%t. Few small differences, engine management/handling + anti/de-icing systems are more complicated on the TP`s however energy management during descent is about the largest challenge you`ll face on the TF's.
My advice is not to differentiate with the TF's and modern TP's, a career on either is equally satisfying. You often get pilots switching between the 2 looking for a better life although supply & demand restricts this movement during periods of recession. The important factors for most are the operator and location, location, location.