There are a lot of great decky plugins, but which one specifically is the most important to you?
Shameless plug but I just re-released my Volume Mixer plugin to the store. It allows you to control the volume of games, programs, and connected Bluetooth sources like phones. I use it all the time since I usually have a podcast or stream going on my phone while playing a game
How does deck + phone work? Your phone uses the speakers on the deck for playback?
Yup! The Steam Deck (or Linux really) lets you use it as a Bluetooth speaker. So I connect my phone to the Deck and my AirPods to the deck and can listen to anything that’s playing through my phone and the deck through my headphones.
Vibrant Deck is nice because it bumps up the colors a bit and makes it seem almost OLED, but I think the actual best is Proton DB Badges. This plugin tells you if a game is compatible (and how compatible) with the steam deck. Steam official playability is notoriously conservative, plus Proton DB can tell you what might not work in a game.