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It seems like AmLogic chipsets are the defacto standard with Google now (ADT-2), Amazon (Fire TV), the S905 is weak and slow, and the S912 isn't certified.
When it's all said and done, the Shield TV is by far the best offering. I've got one of those as well as the cheapest MeCool device, and the difference in performance is astounding. However, once I'm watching something, it's (mostly) fine.
Since you mention fake, I assume you mean certified Android TV devices, you can take a look here - https://www.reddit.com/r/AndroidTV/comments/8ghsc1/full_list_of_certified_android_tv_devices_here/
Basically only those devices are true Android TV devices, with everything working as intended - the good chipsets .
There are some other devices that have a patched on Android TV OS, like Mecool, but don't have Chromecast working nor Netflix 4k, though it seems the latter has been fixed with a workaround. These are what you call the cheap chipsets .
The fake chipsets , as you refer to them, all run normal Android for tablets, with obvious consequences.
If you mean about performance, that depends on what you intend to do with it. Most entry-level TV's have slow chipsets, so be prepared for it. Sony and Philips are the most widespread and have the most complaints, but have improved over time. The best chipset is on the Nvidia Shield. Mi Box is a lottery. The rest there hasn't been much feedback on this sub.