If your traveling party will have mostly adults in the 2nd bedroom, I would go for a lock-off. This way they can come and go as they please without disturbing anyone in the one bedroom section. They will have their own kitchenette to make coffee or snacks. They will have a small balcony/patio of their own.
If they are younger children, I would go for the dedicated, simply for the protection factor of not having a second entry door.
The main differences between lock-off and dedicated at OKW are:
Lock-off: kitchenette, second entry door, small balcony
Dedicated: no entry door, no balcony, larger closet/no kitchenette
Both will have 2 queen beds in the second bedroom at OKW.