All I could find on the philodendron said to repot them annually as needed. No reference to time of year anywhere that I found. Since these are in small pots I think I would repot them now. Use pots 3 to 4 inches larger than the current pot.
You can always look at them next spring
& see what you think about repotting again then if repotting in the spring
works better for you.
about the pothos:
Eventually it will become pot bound. You willknow because the leaves will droop no matter how much or often you water them. This is an indication that the roots have possibly filled the pot. To check this, carefully lift the plant out of the pot, to check to see if that is the problem.
If this is the case, you should now repot ths plant in a pot 1 or 2 sizes larger, with fresh soil.
It helps to trim the plant back at this time also. At this time, if you do not want a larger plant, you can try dividing it or simply takes some cuttings and start over, if that is a better option.
I have simply put cuttings from both of these plants in water to grow new roots.
I have read if you once put them in water (or dirt) they will not grow well if moved to the other medium. Personally I have had no problem with the switch. I often take cutting when I trim mine back & stick them in water until they grow roots then I repot them in an appropriate sized pot.
Good luck !