Multiple Parts with a texture each or 1 union with a single texture?

Which provides better performance?
Multiple parts with a texture for each or 1 union with a single texture?
Texture is always the same.

It seems like the union option does a bit better.

I obtained ~560 fps with multiple parts with a texture each


and then ~610 fps with the single union.

Fps was obtained in-game and not in studio.

I want some more opinions on the matter.

would recommend using parts cause unions have funny hitboxes and lag alot when colliding with stuff
and parts are easier to work with and wont corrupt

Both are not the best. Instead use mesh parts. You can do this by select the part, right click it and select export selection. Then import the file on a modeling software.