I tried Hoarder (KaraKeep) & Linkwarden. Both excellent but I preferred the UI for Linkwarden, particularly on mobile, so I stuck with that - i found Hoarder awkward to edit thumbnails for example though things may have changed in KaraKeep. From Android perspective both have apps but I prefer to use browser plugin. With Linkwarden there’s some hoops to jump through on Android Firefox but it works perfectly once set up. Both excellent choices.
No major difference its just what works for you. I used Hoarder (KaraKeep) in the early days but found I preferred the Linkwarden UI particularly on mobile so switched. But they’re both great.
Strangely I’ve found I tend not to use it for everyday bookmarks use (I’ve put those in a Joplin note). Instead I use Linkwarden for interesting stuff I might need at some point - long read articles or information for projects that I’ll be undertaking in the future, be that videos or written guides. You can set folders (topics) & tags for ease of retrieval.