Some of this depends on what you're doing: dealing with one area, driver vs. show vs. OEM, doing the whole car completely stripped down, budget...
I've done it all 3 ways depending on the car.
BC/CC stands up better to chemicals, bird crap, etc, easier to purchase in some systems, one formula does it all. Also easier to fix scuffs, but harder to fix chips/scratches.
The factory used SS, as we know, and there's almost always a difference in appearance ("depth") between SS and BC/CC. Texture isn't a big issue to duplicate.
Difference in appearance doing half/half is more noticeable to me with metallics than doing all the same, but the average non-car person will likely not notice.
It's easier to get the metallics right with BC/CC than with SS.
If you go with SS, by all means use a catalyzed product.