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).

BYD Sealion 7 is better than a 2025 Model Y Standard and worse than a Model Y Premium in terms of ride quality/suspension and driving dynamics.

The interior is more taste dependent, but the Model Y Standard is clearly a low budget version (with fabric seats) that's below the BYD. The Model Y Premium interior and seats felt higher quality to me, but it has a more minimalist design while the BYD has a more traditional setup with a screen behind the wheel.

The Tesla screen/app seem more responsive and premium. Also above for example VW where things are often sluggish and don't feel as well designed from a UX perspective.