Need to get to ZRH from DEN. Return trip will be from LHR and will be on UA.

I am well over 100k for the year with high spend (almost all in UA BF going TPAC), possible GS re-qualification.

I hate the short flights from IAD-ZRH because you have no chance to get decent sleep (and only full fare J available for the day I want to travel). The shorter flights from EWR would seem to be annoying, plus the fact its a sCO 764, with no bulkhead seats currently available (although pricing is in D class, not terrible).

For alternatives I have been exploring LX from SFO or LAX (longer flight = more sleep), LH DEN-FRA-ZRH (but that is the old LH C on the 744), and routing through FRA via IAD or ORD, which gets me the LH 747-8 at the cost of an extra stop vs the UA options from EWR/IAD-ZRH or the LX options LAX/SFO-ZRH.

I have heard the LX C seats are too narrow and firm for some, and as a bigger dude that is concerning. I know the old LH C seats are not 180 degree flat and are lumpy. And I have heard good things about LH 747-8.

Should I take the one stop flight on UA/LX via SFO/LAX, the two-stop flights on UA/LH on the 747-8 through ORD/IAD, the one-stop LH 744 DEN-FRA-ZRH or just stick with a one-stop UA through EWR and deal with the annoying timing and seats (and use the arrivals lounge in ZRH to catch up on sleep before I can check into my hotel)?