What are the benefits of a solid design pattern vs open weave styled rug pads?

There’s very little difference between a solid patterned rug pad vs an open weave rug pad with regards to performance. A solid rug pad puts more padding in contact with your floors, thus giving an edge with regards to floor protection. On the other hand, open weave rug pads such as Super Lock Natural provide more airflow and thus will pick up more dirt while vacuuming (Dirt is the #1 cause of rug degradation). A solid rug pad will also help prevent liquids from reaching your floors with spills and pet urine.