there isn't any "best" option out there.
there are many really great products available these days ranging from low price to super-extravagant price.
it's all about your personal preference.
and going for a combo you may really be missing out on better products.
if you find a mouse you really like it's highly unlikely you would find it paired with the best possible keyboard and vice versa.
researching both and finding your perfect mouse & keyboard separately would be a much better option.
you would have to list the features that you are most interested in to really give a good sense of what may appeal you.
also figure the conversion from ₹ to $ if you want to include your budget in the decision.
my
Corsair K70 Lux RGB is a very nice keyboard.
the best i've used so far and has held up for 4 years now with no sign of degradation.
i also own a couple very nice mice.
the
Logitech G600 is the best mouse out of ~15 i've tried over the years. have been using it for 8 years and just bought a second for backup.
my Corsair Vengeance M95 is also nice but Corsair has produced a few
better options since then.