At one time I am quite sure Workfront recommended Chrome and said to avoid MS Edge.
But I have heard at least one account that Chrome isn't ideal anymore and for PC users, Edge is the best (despite any official Adobe stance to the contrary).
So…what browsers are you recommending to your users? I'm interested in both PC and Mac, since Mac users are some of the heaviest users of our system (workers). PC users include Planners as well as Reviews and Requesters. We do have Workfront Proof, so it's important the browser of choice is also ideal for proof routings.