What is the difference between the Basic and Pro plans?

The difference between the plans is in the features. Both plans have unlimited links, affiliates, and referrals.
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The standard $14/mo plan lets you create referral links with random ids, which is sufficient for most basic affiliate programs. The links look like this: www.youstore.com/r?id=ie3ejs
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The $29/mo plan lets you create "custom links". With these links you can replace the random ID with a text of your choice, so you can have links like this: www.yourstore.com/hello
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The $29/mo plan also lets you generate unique discount codes for your affiliates, that they can use to generate referrals. This means affiliates can share a discount code with their followers and if that code is used at checkout, the customer will get a discount, and the affiliate will get a commission.