Repair or rebuild with masonry restoration
Most old walls only need the worn joints redone and a few bad bricks swapped out, and I'd rather save sound original brick because it matches and it's already weathered in. If the wall is leaning, the bricks are crumbling all the way through or a fireplace is cracked past saving, patching just buys time. Then we'd talk about rebuilding, a new fireplace installation or a stone veneer installation over a solid wall, and I'll tell you which I'd pick and why.

