You don't even have to register an account (unless you need persistent rooms). Just visit https://senfcall.de/en/ - klick on "start meeting", enter meeting name (password optional), press "start" enter your name and have fun senfing. The call-invite link you find at the top of the chat.
@jgoerzen i'd say it's mainly feature-wise. #BigBlueButton has an integrated pad and shared presentations with drawing. In our experience BBB is easier to change to custom setups. #Jitsi on the other hand is easier to set up.
We can't say much about the compliance of Jitsi, but to be #GDPR compliant, BBB needs a bit of tweaking. We developed some tools for this purpose, which you can find here: https://senfcall.de/en/opensource
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