I like Miracle-Gro for my terrestrial orchids. Better-Gro I've used but I 'doctored' it up to suit my needs. I had great success with Schultz for Catts. I have Catts in it still.
When I first tried M-G on several epiphytic orchids when I went to water the water just pooled. And when it did go through, I'd pour maybe two cups of water in a 4" pot and get a tablespoon of drainage. I repotted immediately.
As pointed out earlier, potting mix needs to suit not just the plant but your conditions that you grow your plants in. You may need to experiment a little to find what works for your collection - which may be a variety of mediums.
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