Try summit! I've tried Boost, Connect, Summit, Thunder and Voyager but only Summit checked all of those boxes:

• Feature complete (shows crossposts, community descriptions)
• Customizable enough (layout, post appearance, show upvotes and downvotes instead of sum)
• Aesthetical design (completely black theme, animations)
• Good user experience (gestures, automatic mark as read)

Only con I can think of right now is that the settings page is a bit cluttered and confusing.