about the Phal: even if you repot it, there's no way to put those aerial roots into the pot without breaking them.
When did you last check the roots in the pot or repotted? It seems to me that the roots are avoiding the mix, so maybe they don't like it?
About the oncidium: if it needs repotting, now that it's putting out roots is a good time. I can see only 3-4 pseudobulbs, so I wouldn't divide it yet. Also the pot looks a bit big for the size of the plant, but this is just my opinion.