Honestly, I was perfectly fine with Jerboa in terms of look and functionality. Super simple, no-frills, and worked well enough. But the 0.18.0 update business introduced some issues, and Thunder was just buggy in my experience, so for now Liftoff is #1. Absolutely gorgeous and highly functional. Can't see myself going back to Jerboa. Though I am really looking forward to having a kbin app in Artemis or @dansup's project