There is really a little difference between these 2 affiliates programs.
Amazon Affiliate Program is free and easy to sign up. After creating an Amazon account and been accepted, you will be asked to create 3 kinds of affiliate links form their Associate login area. Those links are product, banners and stripe links. After choosing whatever link you prefer, you will have to link them to your website or blog.
A special code will be given to you so as to paste to your blog or site and when somebody clicks on your link they will be taken to that Amazon product through your website or blog. If the product sells, you will be paid a certain percentage of the price money.
With this program, you can add links to any item on Amazon's site to your website and get commission when someone clicks the link or makes a purchase. This money eventually accumulates.
Ebay Partner Network Affiliate program
With Ebay, you have to create a store for the products to be bid on and sold at Ebay Partner Network. Make sure the online store you create is based on 1 product niche. Once you have your EPN account, get your Campaign ID number and you are ready to roll. You will earn between 50% and 75% commission of their revenue on winning bids as well as by “buy it now” transactions. EBay also pays you between $25.00 and $35.00 for each new user that registers through your site, as well as affiliates performance rewards.