Either is pretty good. If you're looking for more diverse options I'd recommend 4get or a half decent Whoogle or SearxNG instance.
But you're right that you do have to trust the person or group running it, and I think Mullvad has the upper hand there. It's big enough to attract a crowd, and its caching means the results are extra generic too.
If you're looking just for Google results, Startpage is... Fine, I think.
Running a VPN makes any of these options much better.