Having worked in both Plant Engineering and Aircraft Maintenance I would have to say stay put.
I have found civil Aircraft maintenance to be slow, repetative and ultimately only challenging for all the wrong reasons.
Within Plant Engineering I found my skills appreciated and was when visiting customer sites always treated with politeness and respect. My skills where always being updated as we always had to keep ahead of the competition and I had more opportunity to move within the industry. Moving into aviation was a mistake for me and therefore
I could not recommend anyone entering aircraft maintenance.
Particularly now with the licensing turmoil.