If QOL of life is whats important to you then upgrade time is the last thing you should be looking at. To maximize your QOL go to work for the most stable company that has a base closest to where you want to live. If there aren't any, find the one that will have the easiest commute from where you want to live. Example: Eagle upgrade is uber long (6-8 years at current estimates) but if you live in Dallas its probably the best gig going.