Stuck on which one to choose? Well the difference is simple.
News broadcasts are for sending your bot users one off bits of information e.g. we now stock NorthFace clothing.
Offer broadcasts are, unsurprisingly, for sending your users offers for a set period with an expiry date e.g. 15% off NorthFace clothing until 1st April.
Remember to look at your Usage Stats to see what's resonating with your user base and what's not.