Sometimes original sometimes the Hindi version, depends on how the tune is adopted in Hindi.
A lot of hindi music (both old and recent) are adopted from bengali songs, sometimes both the versions composed by the same composer, sometimes its adopted by another composers.
Such as the song " Dil mein ho tum" by Bappi Lahiri. This track is originally from a bengali movie called "Amar Sangi" the sonag was "Chirodini tumi je amar" ofcourse here the Hindi version is better (in my opinion), mainly because of the lyrics.
Now when the Tagores song are used in hindi in most of case its a mess. (off course everyone dont have the capability to handle the composition of of an nobel lauriate)
For example : Bandhan Khula Panchhi uda ( Yug Purush) is a pathetic hindi version of the wellknow Tagore's song " Pagla hawar Badar dine"
But the song "Chho kar mere man ko kiya tune kiya ishara" is adopted from the tagore's song " Tomar holo suru amar holo sara tomay amay mile emni bohe dhara" its an excellent adoption.
Also the song of Gangstar "Na jane koyi" is from the song " Bhebe dekhechho ki" of the bengali band Mohiner ghoraguli, by Goutam Haldar is another good adoption.
So....depends on how the tune is adopted in Hindi.
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