| Tobi,
I grow most all of my Paph hybrids in conventional plastic pots only just large enough to comfortably accommodate the roots. Over potting for Paphs leads to being too wet and to root rot. If you could see my collection it would look like many of my Paphs are in pots that are too small. Since, in the wild, many Paphs grow in shallow pockets of leaf litter on rocky cliffs, I am inclined to think deep pots are not preferable for Paphs.
Now for Phrags, I try to get tall, narrow rose pots. I currently have some I'm using for Phrags that are only 3.5 inches wide but 7 inches deep. The Phrag roots really seem to like this and they grow good root masses.
__________________  |