Samsung S7 in exchange of an iPhone 6S?

[brentmarble3]

Hi,

So I just got an iPhone 6S 16GB as a gift. But, I'm in a dilemma of whether to keep it or to sell it off and get an S7/Edge instead. Due to the iPhone's poor battery life and just 12 GB of usable memory, I'm more inclined for the latter. Will that be a good decision?
Also, where should I sell the iPhone? I'm getting offers of about 38k on OLX, but I'd love it if I could sell it for anything above 42k. Should I take the iPhone to a local mobile dealer and ask him to exchange it for an S7? What price do you reckon I'll get for it?

Please help.

I didn't find the right solution from the Internet.

References:
https://geek.digit.in/community/threads/samsung-s7-in-exchange-of-an-iphone-6s.198477/
Cryptocurrency Animation Video

Thanks