Putting question elbows in or out

Recently considered a change to my putter but first a technique question

Do you putt with your elbows in resting on your body or elbows out ?

My current method is elbows out which allows an easy rocking motion but can tend to introduce wrist flipping

Elbows in feels slightly restricted but watching the Pros putt at the Masters last week they all tend to keep the elbows in

Any tips / comments please