Used Lemmy first and the Jerboa app. It felt familiar and I wrapped my head around in in a day or two.
Then I learned about the devs philosophies and just decided i didn't personally want to use their program.
I swapped to Kbin and have found the community to be very wonderful and engaging. I found the UI to be very clean. I also love the built in mastadon support.
Kbin is much younger than Lemmy, so things can only improve from here!