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.