What is stronger than PVA glue?
It depends on the glue and what it's used for. Many glues are stronger than PVA, but may not be suitable on wood as PVA is.
Standard yellow wood glue (PVA glue) is the best TYPE of wood glue. Type 1 PVA - or waterproof PVA glue - should be used when any water exposure is possible, and on some woods is stronger than standard PVA wood glue. Most important is a tight fit and clamping. The brand of glue is not as important as the type.