Quickest ( & easiest ) by far will be 1, 14, 11.
Brandon is just off the Barton mills roundabout at the end of the duel carriageway part of the A11.
The 17, 10 route is mostly single carriageway & prone to lots of slow moving agricultural hold ups.
If you do take the A17 watch the speed Linconshire police are not known for their forgiveness.