Are they smooth or textured? Textured look better stained

They are a grain type texture

They look to be currently painted, if so need to paint.

Need a photo of entire front to see what other trim colors you have going on.

I think they are factory primed. I’ve never painted or done anything with them since being installed.

I'm not sure what you mean by staining fiberglass. It can't take a stain the way wood can. Do you mean use a wood look color? Since there is wood right next to the doors I think it would be difficult to find the right color.

For the front door, you could look at colors found in the stone. Without seeing a picture of your whole house I'm not sure whether this would work for your garage doors too or not. How close is the garage to the front door? Is there any stone close to the garage door? More pictures would be helpful.

It would help to see from further back, including the roof, for the shingle color. Given 3 finishes, suggest using a single paint color on the entirety of both doors, for a calm, earthy feel. Given fibreglass, I assume they cannot be stained.

First consider a color and then the next decision is intensity and undertone. It’s important to test the few you narrowed down to. I think rich grey would help tie the finishes and suggest a mid range with warm undertone.

I like Maureen’s suggestion since it appears a warm gray would work with your stone.

I like your idea & color suggestion