I get that. A lot of the differences are only going to be evident as you continue to use the app. If you're already set with Thunder then that's great and I'd encourage you to donate to the dev.
If the ads in Sync aren't an immediate turn off/deal breaker I'd also highly encourage you to give it a real shot over a week or so. There's a bunch of customization options to tweak it just how you like and the app runs smooth as butter, for me anyway. The app was super popular on Reddit for a reason.
Pin-al