^^^ Either type will work, type O is basically what they would have used for everything 100 years ago. But it's very soft and doesn't need to be THAT soft. So it's OK to have a small amount of Cement in there and go with N.
For my buildings I use Type O when it's just patching empty joints. It cleans up better and is super easy to work with. If there lintel work, rebuilding, grind and point, then yeah, N is probably better because it's a bit stronger and you want to really glue any bricks you loosened up tightly in place. O is nice because you can just smash it into the joints and still broom it off 30 min later.
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