Superb courses at a world leading university, but irrelevant to your employment as an FO.
Potentially very beneficial to many other professional aerospace careers.
Quite hard to get into - if you have a "packaged with fATPL" Aeronautical Sciences BSc and haven't significant industry background to go with it, Cranfield may not regard you as sufficiently academically qualified to either of those courses, although the part 66 licence will help.
But, if you get in, and graduate of either of those MSc programmes, you are extremely employable in many areas of our industry. Adding the fATPL to that won't do any harm - it'll just make no difference to getting a right hand seat job.
Later, once you're in the left hand seat, either course is also very valuable in developing a senior career role within the industry.
G