There are several factors that determine poly count(triangles). Like game engine(UE is usually about double unity. Godot was about half of unity, but it’s newer version doesn’t have enough data pushing it to it’s limits.), targeted hardware(console, low end PC, high end PC, VR/AR, or mobile) game specifics, etc. On a low end PC you want total max polygon rendered in a frame to be below 2 million(unity) polygon. That includes simple/complex props, characters, environment, and environmental effects all using 2k or lower textures and LOD.
