Well here is what I know about the different paths. The different paths to commissioning all have their different perks. PLC lets you get a guaranteed air, ground or law contract, but you must get accepted into them and you are less likely to get an air or law contract because they have less spots. You aren't required to do anything during the year at college (obviously other than training which you have to do) but you go to OCS twice, 6 weeks each time during the summers in college. NROTC doesn't let you pick your career choice but they are paying for all your schooling so can you blame them for putting you where they want? You can still become a pilot or Judge Advocate in NROTC but you have to prove yourself to be the best first and then you MIGHT get it. You only go to OCS for six weeks but you do other training during the summers, like Mountain Warfare and going on a Navy ship. The United States Naval Academy is very hard to get into for one and I don't think you could get into it now that you are already in college but let's pretend you somehow made it in. Once you graduate from the USNA you get to put down which branch you want, Navy or Marines, and what MOS you want. Just because you put Air as your number one pick doesn't mean you will get it, it all depends on "the neeeds of the corps". So if you really want a specific job in the Corps I would recommend the PLC program. Just remember you are stuck with most of your college bills though. I am not really sure about the transferring of contracts because you are talking about a totally different branch, but I would have to go with a no.
I hope this helps, Jake