Dino is slim and has some decent features, but Gajim is the client you want to be using today. Gajim has (although mostly broken) Voice and Video support as well as (working) plugin support and various plugins that you may expect.

Dino really fell short for me in my needs for XMPP client, though I'm happy to see federated systems and their clients being promoted.

Specifically Dino has issues with OMEMO support with Conversations, while Gajim does not see these issues. This means I can use Gajim on my computer and Conversations on my phone without issues.