Finishing split level stairs

[Karen O.]

In my project, the stairs leading up are in good shape but require refinishing.  The risers & treads were painted beige and black (down the center). They appear to be oak hardwood.

The stairs to the lower level had to be rebuilt (didn't meet code).  They are new unfinished oak hardwood.

I know I'm painting the risers white.   But I've gone back and forth on what to do about the treads. 

Either strip the upper treads then stain/poly both sets or prime/paint both sets black.  

I don't think I can go wrong with either but wonder if I might be missing something like the amount of work involved.

The only other wood trim in the house are wood stair bannisters with a clear coat of poly. Everything else is painted white.

How would you finish/refinish the treads?

Thanks for your thoughts.

[Mike Reynolds]

@Karen O. If it were me, and I am a master carpenter, I would replace them with more oak. Labor wise it would be cheaper for me to just buy new than to waste the time to strip and refinish those treads. From what you describe you are replacing from a landing (1 floor) so are we taking about 6 or seven steps? Maybe go to HD or Lowes and spend about 100-200 bucks on some Oak and do it easy. Time is money. 

That's IF you have Oak underneath. You will really be mad if you do all that work and find Pine or Poplar under there.