I am flying one way from New York to London in August. So far I have booked an Air Berlin Business award JFK-DUS with 40K Avios and $5.60. I need to book another ticket from DUS to London, say Economy for 4.5K and $25. I will not have baggage, the layover is short [no lounge needed] and so is the flight so spending 9K of Avios makes no sense. Total 44,500 Avios and $31.
I have another open option through Aeroplan with award space in Economy: Singapore to FRA and LH from FRA to LHR for 20K Starwood points and 5K AMEX MR points and $61.
I have seen very good reviews of Singapore Economy on the upper deck. How is that comparable to Air Berlin Business class? As I said I don't need the extra baggage nor do I need the lounge at JFK. I have flown Air Berlin on the single class TLV routes from BER and DUS and have found it very average all round. Is Air Berlin Business class really any good? Is it worth blowing an extra 15K AMEX MR points?