Think of the next small task you will do with cold hands. Would you rather keep all fingers inside one glove, or open a mitten cover briefly? That repeated action is the main difference to settle here.
Leave the coverage closed
Consider the Insulated format if ordinary gear remains usable through the covered fingers. Its cuff still has to fit your sleeve.
Open for short tasks
Consider the flip-back mitt if the inner fingers provide enough access. Count the opening and closing step as part of the routine.
The Insulated selected accounts describe wind comfort and sleeve overlap. Scott’s Glassing Mitt account discusses useful inner fingers and packing bulk. Check how often your day interrupts covered hands: a short optics adjustment and constant small-control work are different tasks.