Help in choosing my first smartphone EVER (Part 2)

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If you're wondering why the title has "Part 2" is because I created a topic before this comparing 7 phones which I have chosen. You can find it here:

So, my budget is 1700 MYR (~385 USD) and this time, I have just 3 phones to compare. Here they are:
1. OnePlus 3 A3000 64GB (Graphite) [Brand New] - 1685 MYR (380 USD)
2. Samsung Galaxy A5 (2017) 32GB (Black) [Brand New] - 1699 MYR (383 USD)

3. Apple iPhone 6 128GB (Space Grey [Refurbished] - 1470 MYR (330 USD)


I really love the specs of the OnePlus 3 but my mom is a bit unsure of the phone since she's never heard of "OnePlus" before (she thinks Samsung and Apple are the only 2 brands that are reliable) so it is a little tough to convince her. So, based on these 3 options, which one should I get? OPINIONS AND SUGGESTIONS ARE HIGHLY WANTED! Thanks!
 

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