TubeMogul and Distributor Stats
First off, if you don’t know about tubemogul, check them out. These guys take care of all the heavy lifting in terms of uploading content to several different sites. And they make it simple to analyze your total viewership. Since the distributor market is so fragmented, tubemogul is the perfect aggregating product.
Second, these guys conducted a very helpful analysis of all the different distributor options out there. Click here to check out their chart (I recommend downloading the Excel file for ease of viewering). They break out monetization options, traffic visitors, and even gender and age characteristics.