If you subscribe to the standard plan ($97 per month), you can receive up to 20000 visitors per month, and if you subscribe to the platinum plan ($297 per month) you can receive an unlimited number of visitors.
It is not advisable to use the Clickfunnels subdomain.
You have to purchase your own domain name for example from Namecheap.
When you use your domain, your business will look more professional in the eyes of your customers or website visitors
Clickfunnels blogging features are limited compared to WordPress.
In fact, it is easier to optimize your SEO (search engine optimization) with WordPress than with Clickfunnels.
So, you will receive more traffic from search engines like google and bing with WordPress.
When You Use Both Paid And Organic Traffic
If you want both paid and organic traffic, you need a website and you have to embed your sales funnels, landing pages, your opt-in forms, etc (created on Clickfunnels) on your website: there is a plugin on WordPress that allows you to embed them.
Keep in mind, if you don’t have a website, you will lose potential customers.
With a website (for example a blog), you will increase your sales (physical and digital products and services) and it will help you to build your email list thanks to the organic traffic.