Well...I wanted to be a Marine - so yes I would rather fly helos for the Marines Meaningful? You are using some strange words here to describe your thoughts about service.
Which would you find more "meaningful"? Providing Rotary Wing CAS to Marines in contact or plucking a fellow aviator out of the water that just ejected off the pointy end of the boat?

There is no comparison between Helos and fast movers or heavy aircraft. Each has their specific mission to play in the larger role. Throughout my career I've seen people initially disappointed with the path chosen for them; yet 99% of the time when you met these same people a few years later, they are all loving their aircraft, their mission, and the people they are serving beside.

You'll have to answer many of those questions yourself - but I can promise you that if you were taken that challenge, you will find the challenge that you are looking for. One more thing....it is true in every service, but just give some thought to how far you get in that jet or helo with one load of gas, when after you land and look around and there is NO support from those other men and women whos' job it is to support those flight operations. Some of those are people who look like they are "just sitting behind a desk" but in reality they are doing a job that is just as important with 10% of the recognition.

USMCFLYR