.......... have now managed to get into double digits with engine failures, for various reasons, in various flight phases, on jet powered aircraft - some leaving me on one engine.......... unless you're on fire or with serious vibration I wouldn't necessarily call it an emergency.
......... my view, FWIW, is don't rush, order a cup or tea/coffee, get as much info on your failure as possible, take advice but be very careful of advice from the ground - soak up the big picture and do what makes you comfortable and yes, consider the commercial implications when all other things are equal. Whilst doing all of the above as well as checklists etc you might as well use the time and miles going towards a better airfield as going around in circles above the departure point. Save the hair on fire dirty dive back in for being on fire....... and even then perhaps not.
Sounds like the Ryanair guys did a professional job.