You also have to see earning rates not just burning rates. Given your travel frequency you’re not going to be earning too many miles.
Check OZ & UA’s earning and burning charts for UA/LH/AI/SQ - the potential flights you can take between USA-FRA and USA-IND.
Also BA & 9W have the worst YQs. And 9W and AI have the worst redemption miles requirements. So go with UA unless you find OZ’s earning charts to be better.