I have probably started using konsole because it was the default, but have since liked it a lot. I use tmux whenever I want to split windows, synchronize keystrokes and things like that but for all else, konsole works perfectly well.

I have set it up in a way that I don't see any clutter. You can hide whatever you don't want to see on the UI. All I see is the terminal and the tabs.

The killer feature is the 'monitor for silence' and 'monitor for activity'. Comes quite handy for long running background tasks that you want to monitor.