its a big debate.... i dont wanna begin it y
cz the only reply i cud give u is that
In which you memorize,learn,create,read or write easily n fast....u shud go for tat.....But mostly ppl opt in UDU y cz of mother language is always easy to portray then 2nd......I hope u got me no tactical n technical references or suggestion i wud give 2 watse otherz time

regards