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Originally Posted by sandra  I've done it both ways and when repotted right after flowering, because of the amount of trimmed roots, the plant generally stresses and loses it's vigor temporarily, causing it to lose it's plumpness especially the leaves. |
This may be true for your particular set of conditons sandra but it's not a universal. I always repot my Cattleya Alliance orchids after blooming and they are not set back. I also have very little root loss with my Cattleyas and rarely have withering or loss of vigor of any kind.
As I said originally it's largely a matter of taste and subject your what works best for your plants in your conditions.