I like clear pots and Phals seem to like them as their roots do photosynthesize. I like that you can see the roots and if they are green in the pot, they are still moist and don't need water. If they are silver, they are dry. Unless Phals are in full spike they can be potted any time. I even re-pot in full spike if I fear for the root system. Choose a pot that just fits the root ball and give it a nice open airy mix. Pre-soak new bark as it doesn't hold water very well at first. If you recently re-potted, you can re-use the bark. same for the Oncid, pre-soak bark and choose a fairly small pot.
The best time to re-pot Oncidiums is when they have a new growth that is putting out new roots. However, if the roots are in jeopardy as an over-potted plant might be, I would re-pot. The clear pots are great for them too. They grow spikes on a recently matured growth so you may have to wait till a new growth forms to get blooms.
Both plants should be watered well and then well drained. Let the Phal get dry all the way thru or very close to dry before watering again. Most Oncids should get nearly dry but not bone dry in between watering. Good luck!
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