Buying iphone 6 from snapdeal

Yes, snapdeal is absolutely fine. I have not bought from it but my friend has, he got what he expected.
I personally suggest that if the price are same, you buy from amazon. Amazon is great for after sale service.

I have experienced as well as I have read various scenarios showing how amazon is better than any other platform for buying phones or anything.

Apart from the topic, if you're going to sell your old phone or if you're planning to buy a used phone in near future, I have an advice just for you. You can rely on Gadzet.in. Its a great platform for buying and selling purposes. They give quality assurance for the same.

Ps: I am a representative of Gadzet.in, you can trust the brand.