Neither. That staining pattern just draws attention to itself, and it's not that interesting. Seems like a huge waste of time for no reward.

HI -- No stain ... the light will fade to an ugly pink and red brick is just ugly . Just paint a nice light beige or antiqued white or a putty color or even a dark grey . Just stay away from reds -- it just never reads well.

Yes, paint it a coordinating color with the siding. Or paint the siding and the brick a neutral color.

Neither why would you want to add this to a brick wall if you don’t like the brick stain it all one color or paint it as a last resort.

consider light sandblasting, might give you an interesting natural look