Are you sure orbot doesn’t slow down the network? I know I have downloaded it on my device when I wanted to access tor on mobile phone but I didn’t use it for VPN purposes though.
Edit:
I just tried it and it’s still the same as other VPN I’ve tried - it’s still slow.
Yeah, the tor network isn't known for fast speeds-- orbot utilize our phone's vpn function and routes our traffic to tor network. You're also more likely to encounter captchas while in tor though it offers much better privacy than regular VPNs as a tradeoff.
If you want the best speed while masking your IP, paid VPN is the way to go-- from a reputed provider. But if you don't have much use case for VPNs, I'm not sure it's a worth enough purchase for ya.