Tor is not a good VPN for me and I've been having consistent small Internet anytime I tried using it. Tor has been knows and a reliable free VPN app to use but I don't think it works for everybody. Orbot has been a good VPN
Although both tor and VPNs are used mainly for the same reason which is improving user’s privacy, they are not the same. Tor is not a VPN, so it’s inappropriate to compare it with Orbot or any other VPN.
However, accessing websites using tor browser is usually slower compared to accessing them via a VPN especially if it’s a paid one.
For better privacy and if latency isn’t a big concern for you, you can use tor over VPN.