Whether it`s a Boeing 737, Airbus ATR or 319/320, Dash 8, they`re all the same. The differences between the turbo-fans and advanced heavier turbo-props are fairly minimal however many hiring policies have not been updated to reflect this as yet. There is still a "perceived" training risk when transitioning between the fans and the props (both ways) so it can be harder to jump between these two classes. There`s pros and cons to either fans or props when it comes to conditions / lifestyle however the operator has a lot to answer for as opposed to type. IMHO, Regional TP flying (ATR or Dash 8) is the best choice for a number of reasons which I won`t go into now.
If you`re self sponsoring without a job lined up, then you must be willing to move anywhere to get that first job and you might have to wait a while, factor in 1 or 2 revalidations. ATR has actually become the most popular regional aircraft with a huge order book. There are more operators per type than any other aircraft worldwide so increased chance of interviews. The fact that a lot of people still feel they need to fly a "jet" (yawn...) often leaves an opportunity for the wiser.