You can undoubtedly switch between the two-however, this VPN can still meet your standards. NordVPN does the same but has the option of using Internet Key Exchange (IKEv2). ExpressVPN utilizes TCP and UDP protocols.
Both these contenders likewise distribute their VPN conventions. For comparison, both ExpressVPN and NordVPN mention that they utilize the Advanced Encryption Standard with 256-digit keys or AES-256.
Note, however, that the app doesn't freely explain how it can do this. This VPN program gives you access to sites anywhere in the world. Likewise, you can choose your preferred server or hub. From here, you will be connected with the closest server. You won't be prompt to perform any root access to connect to a server either.