I totally get what you mean about the ads; it’s become a huge issue with most free-to-play apps lately. If you're looking for a more "premium" feel with a lot of variety, I’d suggest taking a look at
https://betonred5.com/. I started using it a few weeks ago and the first thing I noticed was how fast the pages load on a mobile connection. The UI is very intuitive, so you don't spend half your time just trying to find where the games are. They have a solid mix of classic and newer titles, and the performance is smooth even if you aren't on the latest flagship phone. Definitely worth a look if you want a more streamlined experience without the clutter.