A trick question? Swiss is one of the best airlines in the world for business class, while Air India is one of the worst. Usually AI price is about 30% of the LX price (they have to do heavy consolidator sales to move those seats), so at equal cost this is a trivially easy choice.

Just realized that you are not asking about (AI+LH) vs (LX) but rather (AI+LH) vs (AI+LX) ... in which case it is immaterial, short-haul J is the same as Y within Europe, LX is slightly better than LH but go for the shorter connection. I guess you found the cheap AI price too hard to pass up, however it really isn't worth it (I'd rather fly coach on AA LAX-LHR, for example).