How dry to you let your orchids get before watering?

[Foogoo]

I've got mostly phals, a few catts, dendrobium, epis and oncidiums. Most are in medium bark, a few in fine bark, sphag and coarse bark.

I've mostly read, especially in beginner guides, not to water until the medium is dry, i.e. visually dry, light in weight or a stick comes out clean. However, the more I've been reading, many sources suggest that especially phals and oncidiums do not like to go completely dry.

So what has worked for you? Now I'm watering on a weekly basis when most of them are between dry and slightly moist.