Definitely Finnair! Finnair has the best Tehcnical department of all airlines in the world. That has been proven. Pilot's are amazingly great! They know their job well. No accidents. As of what I recall the only accident (where an aircraft and a lot of lives were lost) happened many decades ago while still operating under the name "AERO OY". Sure, the service from the flight attendants isn't the best there is to offer on some airlines, but that's not the most important thing, is it
And, we shouldn't forget that the very last year, Finnair celebrated it's 75th birthday! Yes, Finnair is one of the oldest still operating airlines in the world, and it sure has proven to be one of the best airlines there has been, there is now, and there will ever be in the Earth as we know it!