Hi Sweath,
You have 6 years of system admin experience so based on your experience it makes much sense to go for BASIS but you need to check the job market before you take a decision. If you have taken training in BI then you can continue building your skills in BI also as it has good scope and you can also learn HANA as its new and its demand is going to be high in the upcoming years.
Good Luck.
Nagarajan Viswanathan
