Re: OnePlus = Apple for Android
Nope. That would be Xiaomi. The so-called Chinese/Apple of Android.
OnePlus, Oppo and Vivo brands are owned by the same company.
https://en.wikipedia.org/wiki/BBK_Electronics
OnePlus just has Oxygen OS compared to the clunkier skins of Android found on Oppo, Vivo etc. Hardware-wise, they're more or less the same, with Oppo/Vivo more aggressively targeting lower price points in developing countries.
Huawei is a more interesting situation... it manufactures telephony equipment and peripherals (think Motorola), and it also uses Kirin HiSilicon chips, designed and produced by Huawei. In that aspect, Huawei is similar to Apple (A-series chips) and Samsung (Exynos).