BFS/BHD-MAN
Ryanair is on average cheaper than easyJet by approx £20, albeit with a less business-friendly flight schedule.
Ryanair's flights coincide with Flybe's cheapest flight of the day, so it works out cheaper on most days with Flybe if you want to depart mid-afternoon. However, Ryanair is approx £10 cheaper return on average when compared with all 7 Flybe flights.
I shall be sticking with Flybe for my frequent trips between Manchester and Belfast. 7 flights a day and a much more comfortable terminal experience is far too appealing.