Everything has been said, those 4 VPN providers have the best track record and are recommended in the privacy communities.
I'd say check their feature sets against your desires and then test the ones you can imagine using. I tried IVPN, Mullvad and Proton VPN each for a month and ended up using Mullvad because it had the best stability and speed where I am. IVPN came in as a close second so I book and use it every once in a while. Your mileage may vary.