This is a trick question. the solution might be both, considering on what you're selling and what your costs are.
Paid traffic will still reach your site until you stop paying for those keywords. But if the keywords you're using convert at a tremendous rate, then you ought to be ready to afford the traffic.
On the organic side, if you've got keywords sending organic traffic, then during a sense that traffic costs but the paid, and in contrast to paid search, as long as your organic traffic stays ranked, you ought to still get that traffic.
Most smart marketers use paid search to get the keywords that convert, then follow those terms organically. That way (in theory) you’ll have traffic and conversions while the organic rankings climb within the SERPs.
There are many other examples that would lean towards one being “better” than the opposite , but you'll got to factor those costs and therefore the conversion rate to work out what's best.