pick your choice or get both...

most ppl would agree to get brake pedal lock as it is more secure... but you need to remember to open the lock before driving... if you have extra budget, got the type that tap to your ignition so that you can't start until you open the lock...

or, the steering lock will work as well... though no extra features...

anyway, thief usually dont bother to touch the car when they see the car got extra security like steering lock or brake pedal lock... unless they're really determined...