Bro car insurance and chor locks / Steering locks are totally different things.
In car insurance, theft is automatically covered now a days, but the same is not true for vice versa.
GOD forbids, if any thief decides to get some vehicle stolen, no chor lock / steering lock can stop him. They are always one step ahead.
But if a car is insured, theft, accident and other things are automatically covered in it.
If a car is stolen, insurance can still give some benefit, however, just relying on chor locks / steering locks, if car gets stolen (GOD forbids), no compansation can be made.
I would suggest you to go for insurance, however, you can also keep a steering lock as an additional protection, but both cannot be compared in any aspect.