I was a huge fan of comedy and movies and TV growing up and I was able to memorize and mimic a lot of things not realizing that that meant I probably wanted to be an actor. I just really really amused myself and my friends with memorizing entire George Carlin or Steve Martin albums.
It really depends but generally speaking just because of the mechanics of it voice-over is easier because there is no hair no makeup no wardrobe no fittings no line memorizing. You don't have to me woken up in Russia at 6 in the morning and go film a scene. It's just easier on the body the family life to do voice-overs.
I am interested in a lot of things - not just show business and my passion for animals. I try to keep current in what's going on in the world. I do mental exercises. I don't have any trouble memorizing lines because of the crossword puzzles I do every day to keep my mind a little limber. I don't sit and vegetate.