I have 2 options for paying khums sehme imam
a)Pay to Marja office & get a receipt
b)Pay to an organisation or for a worthy cause known to me,which has the permission from my marja to collect khums Sehme Imam

Similarly I have 2 options for Sehme sadat
a)Pay to Marja office
b) Pay to sadat person(not a relative) directly based on my own investigation of eligibility

In the second option there is a small risk that the full amount may not get spent correctly in sehme imam and for sehme sadat my investigation of the eligibility may not be accurate.
In the second option the recipient also becomes grateful to me for my 'donation' though it is khums money & not my charity

However in first option I have the effort of finding good eligible causes & benefit of observing the end use /benefit to the cause /person.

What should be my choice & is there ANY reason /greater sawab to choose option b ?

The sehme Sadat can be given to a worthy sayed.
However sehme imam as has so many restrictions one should give to the marje directly or through his official office and get the receipt. S sistani dz says u must collect the receipt from his office.