Thanks for your thoughts, everyone
So what I'm getting from this is that Stress Coat is great for treating some ailments but is rather expensive as a regular conditioner. Prime on the other hand is a great conditioner and is economical.
I also had a look at a bottle of Stress Coat in the store this evening. The instructions have one measurement when you use it for treatment and another measurement specifically for conditioning your water. Theoretically, you could have some Stress Coat on hand as part of your fishy first aid kit and let Prime take care of the regular water conditioning.
What do you think, am I understanding things correctly? Feel free to correct me or weigh-in with alternative opinions of course. I want to learn as much as possible