I'm only familiar with Northwestern Mutual by reputation.
If I may ask you, what makes their 'new' DI policy better than Guardian's DI policy that has (traditionally) been thought of as "the go-to" DI product for physicians and surgeons?
My understanding is that with Gaurdian. if your unable to perform some of your duties, but not all, you must be still working in order to get a partial benefit.
With Northwest you can be in the same spot, but don't have to be working in order to get the full benefit, or you can continue working and take a partial benefit.