I'm looking to book a one way using united miles, either from the US to Europe, or Europe to the US, depending on which way I can get the best flight. I think I'd rather fly a partner biz class rather than united first, just to try something new. I'm seeing business class availability on lufthansa, TAP, Tyrolean, swiss, etc., Which airline do you think has the best biz class product? Are there others that I should look for availability on that I may not have considered? Thanks!