When comparing Kodi vs Sayonara, the Slant community recommends Sayonara for most people. In the question“What are the best audio players for UNIX-like systems?” Sayonara is ranked 7th while Kodi is ranked 39th. The most important reason people chose Sayonara is:
It is so flexible it respects your local theme, or can be set to a theme, very slick, independent dark mode. And yes, it does show your cover art!
Specs
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Pros
Pro Can install on several devices
Android, Mac, Windows, Linux, iOS, Xbox, Apple TV (jailbroken), and more.
Pro Lots of plugins available
Like PlutoTV, Curiosity Stream, and YouTube. 3rd party repositories, such as the SlyGuy Repository, contain more plugins like Disney+, Paramount+, Hulu, and Netflix.
Pro Free
Pro Open source
Completely FOSS, licensed under GPL 2.0
Pro Great customization/multiple skins
You can change navigation flow and other aspects of Kodi with the plethora of customization options and skins.
Pro Can play many different file formats
It supports Blu-ray Discs, CDs, DVDs, USB Flash Drives, local Hard Disk Drives, AirPlay, network file shares, basically every video, audio, and image format available, subtitle files, and even retro game console ROMs.
Pro Looks really cool, and does have cover art
It is so flexible it respects your local theme, or can be set to a theme, very slick, independent dark mode. And yes, it does show your cover art!
Pro Closes to panel while playing...
It closes to the icon (tray) on your panel, while it keeps playing. Clicking the icon you can open it again, or pause/ stop/ play it there. Great to get it out of your way when you're working with cool sounds in the background.
Pro Does conky...
If you are one of those who like to close your player to panel and see what it plays in your conky?
Sayonara can do that over dbus, whether you like just artist and title, a progress bar, or even the cover art in your conky.
Pro Sorts by the users options
Has everything you may need onboard.
Pro Many plugins standard
Has many plugins out of the box, e.g. internet "radio"streams, equaliser, sprectrum analyser, bookmarks, audio converter, broadcast, playlists, lyrics for the song you're playing, and more. It's the full music enjoyment experience. If you like minimalistic, Sayonara can do that too.
Cons
Con You may have to jailbreak some devices
This is only for things like a Fire stick, but Android TV boxes etc. should be fine.
Con Terrible navigation
Menus over menus with dozens of submenus.
Con Not Client/Server Capable
While most solutions provide a client/server setup the KODI developers REFUSE to adopt this approach forcing individual setups for every device.
Con Poorly optimized
Often not a fluid experience on low-end devices.
Con No official AAA addons for streaming services
It does not have any official AAA addons and fully relies on the community which result in often broken packages/addons.
Con Playlist driven play back
If you install Sayonara, hook it up with your music directory, and want to have it play by clicking a music file and let you surprise yourself with its shuffle... it won't. It will play that double clicked song, but then just plain stop untill you double click that next one. To have it just play through your collection, you first have to make a playlist, and only then let Sayonara play that (randomly). No deal breaker, but certainly an non-intuitive hassle preventing "click that in my library, play and don't bother me no more".
Con Dynamic playback
Sayonara works with a dynamic mode shuffle method, that quite often eliminates any surprises and comes with "the same" suggestions when your collection is smaller. It can be switched off though (bottom left switches, under your playlist) if you don't like it. All the options will require you to "look into it" though, since it is somewhat confusing...