I`m currently enrolled into United Mileage Plus, but noticed that Lufthansa`s program requires less miles for an award travel. I earn miles by flying on Lufthansa mostly (not much, about 10-20K/year) and shopping on Mileage Plus Mall. Should I enroll into Miles&More to have a lower miles requirement for redemption, or is it harder to redeem through Lufthansa/more tax/etc, and I should continue to earn miles on United Mileage+?