What do you actually want to do?
There's a huge variety of trades in the RLC (and the army as a whole)
Think what job you'd like to do and speak to your recruiter who should be able to advise you of something similar. If you have no corps allegiences then capbadge shouldn't really matter when you join up.
Concentrate more on finding a job you want to do rather than the corps you do it in. The allegience/loyalty will come later.