Ok, your potting mix depends on alliance for the most part. Cattleya genre need to dry quickly, Oncidium intergenerics USUALLY like a well draining mix that you don't ever let completely dry, Vandas like something that will dry extremely fast (a day or maybe 2), Phals like something that stays moist but not soggy in the middle. So, the mix you choose needs to work with your growing environment. For me, I use CHC and charcoal for Phals and Oncidiums, but sometimes with more charcoal and more drainage for Oncidiums. And for Cattleyas (I'm just a beginner with these) I use hydroton and a little CHC and water every day to every three days depending on the heat.
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