Which is Safer: through roof or through wall Class A chimney?

Hello all, first post here. I've burned wood before, but always with a masonry chimney in a big old house where you could crank it 24/7 and just monitor the stove pipe temperature and be happy.

Now I've got a much different situation. I want to put a small woodstove in my well-insulated ~700 square foot 2nd story over unheated garage (insulated floor, walls, ceiling in 2nd story). I've got an asphalt shingle roof (7 / 12 slope) and two possible locations for a small stove.

Kitchen location would be near wall and in that case I'm inclined to NOT put a hole in my roof, but to go through the wall and up ten feet or so. My preferred location is living room, chimney going straight up through the attic just to one side of the roof ridge vent (modern, ten year old building here, currently heated with Toyo Laser 73).

I'm a safety first kind of guy, so how 'bout it? Which is safer?

Thanks, and it looks like an excellent forum.

Safe-Burner to be.

Hogwildz said:

Agreed with previous replies. I'd only add that unless your plan on having minimal 12', preferably 15' or more of stack, your going to most likely have smoke spillage and draft issues.
In this case, less is NOT more.

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Thanks for replies. I'm guessing 5' to ceiling, 7' to roof, 2' above roof so 14' including stove pipe and metalbestos. Likely 6" stove pipe. I'll likely get a professional install, so if I need more chimney I suspect they'll be happy to sell it to me. I'm glad my preferred choice of through the roof seems to make sense to all who posted. Will follow up with more questions later.