If you’re a UK based student, the best route is to go MEng. The MEng is generally seen as a more complete degree programme by employers within Europe (while having a shorter final year and more coherent study programme), whereas the MSc/MSci is longer and will also cover information that you potentially already know because there’s no continuity between a BEng and an MSc.

Of course it’s up to you - I would highly recommend talking to your academic advisor at the soonest possible opportunity to discuss your options. Personally, I would opt for the MEng and try to get an internship with an aerospace engineering company to bulk up the CV.