I think both water should be ok. If you look on label it should tell you concentration of minerals. So you can decide what is better. But i would think it will be pretty much the same.
Probably, im not expert here, your problem is slow release ferilizer. Maybe with your watering schesule it releases more fertilizer than its needed, your condition definitely is different from green house it came from. So what was good for GH maybe not good for you.
There was another post where roots were dying after growing inch inside the medium. The bark also contained slow release fert.
How long ago did you got plants, maybe its just stress from shipping?
I dont have any dend yet, maybe its just the time to drop leaves?
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