Both options are very good. Neither the wallet nor the writing assistant impact your vpn experience, so not sure what you’re looking for in alternatives.
Anyway, sticking with proton or using mullvad are two equally good but different options. Want a VPN without port forwarding and only a VPN? Mullvad. Want port forwarding, or are interested in using their other privacy minded products? Proton.
https://protonvpn.com/support/port-forwarding-manual-setup/