Go with bmi, as a Dutch resident you can join (not all countries can). The thresholds for Gold and Silver are woefully low, yet you still get Star Gold (38k miles compared to LH
's 100k miles) and Star Silver (16k miles).
Award redemption are very generous
Upper Class award seat to the US west coast is just 100k miles and you can combine cash and miles on all Star Alliance partners, for example SQ
is just 80k miles + £540 cash!
I've got both LH
Miles & More and bmi Diamond Club and am now putting more and more of my *A miles into bmi.
"My first job was selling doors, door to door, that's a tough job innit" - Bill Bailey