Bro in the 2nd category Santro club is the best option imo.
sure mehran has cheap parts and maintenance but you have to travle 50 km
Daily so comfort is a must which the mehran lacks...what it does have is economy...
But you gota cut corners some where you can't have everything.
Regarding santro vs Alto ..well santro is just better than alto.. I've driven both of these cars for extensive periods.
some people do think that santro has an uncomfortable driving position..but well that's a personal choice..
So better yet get some test drives ..do a complete survey of the market....
Because in the end its you who's going to be driving it daily...
Best of luck