If you had to pay US/EU prices for a Tesla vs BYD you'd go with BYD no question. But the majority of Teslas are made in China and when put a Chinese made Tesla alongside a Chinese made BYD it's a coin flip.

So as an Australian I'd roughly rate them the same with BYD high end matching Tesla's high end and BYD having a low end that Tesla doesn't compete with (the Atto which is ~USD $15000 for a small electric hatchback has no Tesla equivalent).