Cranston makes several different lines of fabrics, at different quality and price-point levels.
Cranston branded stuff is sold a lot in chain stores and is a lower quality than their other fabrics.
Cranston VIP is sold in many chains and is a slightly higher quality fabric.
Cranston also makes Quilting Treasures fabrics and QT VIP, which are are said to be sold exclusively in independent quilt shops, although they also sell in large online stores that aren't independent and are part of chains, such as fabric.com. They are mostly focused on licensed and novelty fabrics.