I have been mostly sending traffic directly to affiliate sales pages. Is it better to presell using a landing page?
A good presell will increase your sales. A bad presell page would hurt your sales. If you are having good luck sending directly to affiliate sales pages, keep doing that. At the same time, chose one or two products and test your results using landing pages. It may take some time to tweak, but if it increases your sales it will be worth it.
Go for pre-sell. people usually turn off with direct selling and it even worse now when there are ads every where. just take a look at our email.