ffWorks is better by an order of magnitude than any other video converter available for macOS. I have tried everything, and there really is nothing that compares. It gives you the ability to tweak just about any of the hundreds of settings available, and the comprehensive tooltips for each setting go a long way toward helping you understand them. Or, you can just select one of the easy presets and you'll still end up with a conversion that's highly faithful to the original.
What's more, the developer team is HIGHLY responsive. I cannot even count the number of times I have emailed them about some aspect of the process that confused me and they responded within a day or even within an hour! ffWorks is well worth its modest price.