Just crt-mattias.slangp for the most part. It's before the crt-royale stuff on the list as you scroll to activate a preset. There are better shaders per scenario, I really like the crt-yo6-KV-M1420B-sharp (or not sharp) .slangp with the Saturn but any games using its high resolution mode, like Virtua Fighter 2, are a mess as it assumes low res output specifically. Hylian variants also look pretty cool in many cases, but the mattias shader generally works great across the board as a catch-all solution I don't need to switch per core/game or even when using actual 1440p+ 3D game rendering.
Thanks for the info. I have a pretty decent Launchbox setup and getting the right filters for a lot of these systems have been nagging me.