Metallic map material or speculair?

Hey guys, I am a Substance Painter user. also the other substance software. but when i import it to unity i have to keep tweaking the metallic and roughness settings in substance if i wanna get it to look decent in unity. while im just wondering if speculair makes more sense? how do you guys solve this? i've been searching around on the internet alot. but even the video's with the title saying it solve this. it still wont make sense and you still end up with nasty shading. i talk about the metallic influencing too much, when the metallic is perhaps slightly too much it becomes super glossy. i tried making the metallic greyscale in unity. but this still won't make sense that much.