Civic is a "Market Ki Car", you will not face any issues; parts easily available (although costly, depending), authorised Honda dealerships available (but at the same time, ShahNawaz is also there for Mercedes), good resale, etc.
When it comes to handling, stability, there is no match between Mercedes and Japanese car manufacturers (provided we are comparing cars in the same league).
At the end, it all comes on personal choices, and if thinking of Mercedes being a never ending money pit, "Ghabrana nai hai"
, its not like that!
Darr zyada hai, and haqaiq ka kamm pata hai.