Congrats and good luck with your decision!
FedEx is great, just too much flying at night. I know it is not as much as it used to be but still a lot. Not minding being up all/most night (15 nights a month) in your 30's is one thing, but in your 40's-50's-60's is another.
What an awesome opportunity, though. Was a pipe dream just 2-3 years ago..