Hello @alexlii,
Sorry for the delay.
To answer your question we need to consider if you have a Sucuri subscription or not. If you have, then you have access to a service called “Sucuri Firewall” [1] which is a filter that lives between the Internet and your website, and blocks attacks. In this case, you would not need Wordfence at all.
However, if you do not have a Sucuri subscription, then you also don’t have access to the firewall. I believe Wordfence has a rudimentary firewall among its features, so I suppose you may want to keep it active to add some protection to your website. In this case, you can keep both plugins active.
Additionally, I’m not aware of any incompatibility between Wordfence and the Sucuri WordPress plugin, so in theory you could keep both plugins running at the same time, but as I said, if you have the “Sucuri Firewall” then having Wordfence is unnecessary.
Marking as resolved, let me know if you need more information.
[1] https://sucuri.net/website-firewall/
