The Collector’s Series is DW's pristine line of drums. While the drums are higher quality than the Performance Series drums, the big difference is that the Collector’s Series is custom. This means that you can custom order a kit from DW, and they’ll make it according to your expectations. Over the years, DW has made Collector’s Series kits from weird and wonderful woods with odd sizes to match. On the other hand, the Performance Series will always be a maple set of drums with standard drum sizes. If you want to read more on the differences, you can check out this article.