Go AV. I got two tool kits instead of one, as AV were cross-trained (yes Nutloose, including in-flight entertainment!) whereas Mech weren't. I'm sure MoD are more enlightened today.
Go AV, if only to avoid having to hone a main oleo. Most boring job on God's earth.
But remember the definition of electricity. It's magic and it hurts if you touch it.