I’d stick with Amazon if I were you. All of my Amazon sites only have Amazon affiliate links. If you use Google Adsense display ads on your site, you’re literally taking people away from your site for the sake of just a few cents with these type of ads. If you direct them just to Amazon, then you have a greater chance of earning more money from that click.
The position of your ad is determined by several factors that give your ad a score based on the quality of your ads and how much you are willing to pay per click. Even if other brands are competing for the same keyword as you are, it is possible to rank above them and pay less per click, but Google must see your ads as highly relevant in order for this to happen.
888.com is a premium gaming destination and a well established name in the casino and poker circuit. Its site offers numerous sub-brands including 888sport, 888ladies, 888bingo, 888casino and 888poker, as well as ReefClub Casino. The 888 family of companies attract millions of players, and the company provides affiliates with frequent promotions to keep players interested.
On the other hand, we have affiliates, who are looking for ways to monetize their online presence. Affiliates (also known as publishers) are often bloggers and influencers who enjoy online reputation and a considerable following. This enables them to affect buying decisions of their followers. When they recommend a product, they encourage their followers to buy the same products. This activity is known as a conversion, and it is what enables affiliates to earn from this kind of strategy.
How established is your site/blog/social media following? Do you already have an audience of 1 million or are you just getting started? Early on in your affiliate marketing journey you will probably want to have multiple options to make sure you can cover a broad field. You might want to become an Amazon Associate as well as joining one of the networks so you will have a product link to drop into any posts you do. An easy place to start is to promote the services you are using if you are enjoying their product - web hosting or email management systems like Aweber.