I would like to see your house always when asking these types of questions since the firat thought for me is why black . The ONyx looks bit more black to me if that helps. Black doors fade quickly in bright sun BTW

This is from Therma-Tru…

Therma-Tru's Onyx and Obsidian door colors are both dark, but Obsidian has a cool, dark undertone, while Onyx is a true black without undertones. Essentially, Obsidian leans towards a cooler, darker black, while Onyx is a neutral, true black. Here's a more detailed breakdown:

• Obsidian: A dark, cool black.
• Onyx: A true black, without warm or cool undertones.

Both colors are finished with the Therma-Tru's PrismaGuard® process. If you're unsure which color to choose, it's recommended to order samples of the paint in your desired grain pattern to see them in your location.

@patricia Coldwell Consulting the front of my house faces north.
I believe black is a nice contrast with the red brick and light siding

@chloebud thank you so much for the detailed explanation