I depends, for sure there are some benefits, but I think both can be equal, depending on your strategy, niche and on what you will put the ads.
CPA is also type of Affiliate marketing. Instead of being paid per sale, you are being paid per lead, which is easier at times. so yes, CPA is easier compared to CPL product.
It really depends on how many real visitors or users you got on your page or site. Since both of them are based on the number of users or people who view and take action onto your page, then you can't really tell which one makes money faster, especially if you don't have enough visitors or users on your page.
CPA is much better than Affiliate marketing in my opinion. Depending on your niche, you could potentially earn thousands per day.
Only yourself know which is better for you, but that is only your feeling, perhaps others not. So, for me, I preper CPA.
Making money with CPA there are no refunds. With going after Clickbank products or digital products there maybe possibilities that someone will ask for a refund and you will not get paid. Whatever you make with CPA it is all yours, again NO refunds will have to be made. Either way they are both great ways of making money online.
I am currently looking at all types of IM and tying to find out what to start in. I belive that CPA is one of the easier ways to make money, yet my current idea is a very niche based around products so oviously selling the products to the cutomers and making bank from amazon will be better for my first project :] . Cant wait to start a CPA site though