How To Easily Bag Commissions For Affiliate Marketing Services?

The 'easy-to-get-paid' factor is so much glued to the affiliate marketing services that anybody wants to join affiliate marketing industry. Free of cost joining, easy access to resources, quick responses from customers, varied industries to work for, scope for earning income from multiple streams and various commission structures to opt for according to marketing skills are some the advantages that made affiliate marketing ubiquitously popular. After doing some researches, I came across two main categories of commission structures a marketer can be paid for his/her affiliate marketing services. Pay per click wherein I can be paid for each click I generate for visiting site, taking membership or buying goods. And there is pay per performance wherein I can be paid hugely for every sales referral. So, please suggest me which commission model should opt for to earn money with affiliate marketing services?