Emrys Green's reply:
Different routes are better for different people. It sounds like you’re more interested in sound but you could certainly take a course or apprenticeship that gives you a bit of a mix.
As an employer of technicians I would be looking for your practical capabilities and experience. So if you were to go for a college route then I would recommend going for a practical course with plenty of vocational opportunities.
If you are thinking about progressing to a university level qualification then it might help to consider this article available from Drama UK (a site where you can also search for relevant courses):
Drama UK - Expectations of students starting a university lighting course
For a perspective from a technical theatre apprentice you could also try reading this article on the Arts Award Voice website:
Arts Award Voice - Apprenticeship overview: Technical theatre
Have a look at both options and definitely have a look at apprenticeships, but you could be limited to what you have around you.
Best of luck!