Stance-changed Single Leg Deadlifts

When I program for my clients, I don't use too many variations of the single-leg deadlift. I tend to teach a single-leg Romanian deadlift as soon as I can. That usually means two-legged deadlifting and single-leg balance before I progress to them. These, however, really intrigue me. They're a potentially useful tool to get the single-leg effect before you need to ensure the client has the balance to load them effectively.

WHICH SINGLE LEG DEADLIFT OPTION IS RIGHT FOR YOU?

I plan to implement these with myself first . . .