Basically, Plesk has 3 license categories. Each license has different features, functions, and prices. It depends on the needs you want.
Web Admin
Some of the features available:
- Power user view (server + site admin)
- Plesk mobile manager
- WordPress Toolkit (limited features)
- Security Core with ModSecurity Rules by Atomicorp
- ServerShield by CloudFlare
- Outbound antispam
- Max 10 domain
Web Pro
Available features:
- Subscription management
- Account management
- Power user view (server + site admin)
- Custom view management
- WordPress Toolkit
- Postgre sql feature
- Max 30 domain
Web Host
Available features:
- All features available
- Unlimited domain