I've not a preferred but with technical arguments:
oak leaf is really effective and moreover usedm with really slight difference in 2014 by Russians so imo is absolutey the king of patterns. No other pattern rexist 70 years!
blurred edges is really modern
plane is really nice to see and favourite for my eyes
polypost is the precursor of modern german patterns so, techinically is mine 2nd favourite pattern
I don't like too much the palm... for technical reason but colours are very cool.