Hubpages relies on search engine traffic much more so than the other two sites, Wizzley only getting 8.5% to 11% of it's traffic from this source. This means that around 90% of traffic arriving at your articles on Wizzley will be generated from directories, social media, bookmarking sites, commenting (see 'Why comment?') and other internet properties. You will do well to utilize the buttons on your article page (see 'Why Tweet?') and those on other writers' articles, until such time as the search engines give Wizzley articles more kudos. This will come with time. In the meantime, if you rely entirely on getting free search traffic you may not do so well, in terms of search engine traffic, at Wizzley.
Wizzley gets 39% of traffic from the US, whilst Squidoo and Hubpages get 33%. This means that the Wizzley US audience is greater, such that marketing to that audience is better targeted. The same is true for the UK, Canada, Australia where there is at least a 20% positive difference between the Wizzley audience and that of the other two. Europe is also a positive environment to market to.
Hubpages and Squidoo have a high proportion of visitors from low income countries in Asia. This means that average adsense value may be lower than for Wizzley. If you write for adsense income your returns per 1,000 views may well be higher at Wizzley, and may make up for the lower visitor footfall.
The audience demographics for Hubpages and Squidoo roughly equate: 18-24 female with some college education, browsing from home. Wizzley is differentiated in that, although the demographic is biased towards females browsing from home, they are more likely to be between 25 and 54 (somewhat older than for the other two), with a higher education background, and with children. This means that they are likely to have more household income that will be spent on their children and household requirements. They may also be more inclined to read and utilize information aimed at school work. Marketing these sorts of product and information may find you a customer base.
The bounce rates (where only 1 article is read for each visit) are high for Squidoo and higher for Hubpages. At 42% Wizzleys' bounce rate is just 2/3rds of that for Hubpages. This means that, once on the site, visitors are much more likely to browse additional pages. Whether this means that they do not go off and do their buying on Amazon is speculative.
Interlinking articles may be better provided for by the Wizzley modules, or the community better understands that linking articles within the site mimics what the search engines are looking for on the internet in general. A healthy linking strategy, whilst the search engines decide whether articles on the site are worthy of higher ranking kudos, is paramount for earnings for each of us, and the site in general. This is how we pay for the privilege of writing at Wizzley.