I recently saw a post about many VPNs, which exposed the fact that many have some kind of connection to China. If you would like to compare more VPN providers, I would recommend https://techloris.com/best-vpn/
I've been using Express for a few years, but their iOS app is flaky. I'm not testing NordVPN and PIA VPN, but both experience a significant drop in bandwidth, when I use them. I never had that issue with Express.