Hi Chenna,
Leave the comparison aside. HANA has a bright future, no doubt about it.
Learning only HANA will not fetch you in grabbing the opportunities. After doing modeling in HANA, next is doing reporting on top of HANA. So I will say give priority in learning SAP HANA + BO.
Then your next focus should be learning BODS, BW if you have the patience and passion to learn.
A perfect BI consultant is the one who has knowledge on SAP HANA+BW+BO+BODS.
Its very rare that you find such a guy having these combination skill set, but who ever has will definitely excel in their career.
Finally you are the one to decide which one to go for based on your capabilities.
Wish you all the best.
Regards
Raj