A. The Viking is our mid-line bunk bed, like a Buick. The Paul Bunyan is our Top-of-the-Line bunk, think Cadillac. The Paul Bunyan is sturdier. The Viking is appropriate for kids up through teens. The Paul Bunyan is sturdy enough for even good sized adults. The main difference is that there are more 2X6’s used in the construction of a Paul Bunyan.