If you are looking for the technical differences often cited in these reports:
: Premium users can utilize a Static IP to avoid login errors on sensitive sites and have the ability to manually select their preferred server. How to Get Premium Access x vpn free premium account top
Evaluating a VPN (practical checklist)
The free version is a "good-faith" service that funds its bandwidth through mobile ads rather than selling user data. If you are looking for the technical differences
Optimized for Netflix, Disney+, and gaming (lower ping). and gaming (lower ping).