The "MSU" fertilizers - RO, WW, and K-Lite, which is derived from them, are all excellent. Better Grow is good too.
Nitrogen is the most important fertilizer nutrient, so that should be your primary focus, and to change from one to another, you should shoot for the same nitrogen loading in your applied solution.
Personally, I recommend that about 100 ppm N be applied weekly. Better Grow Orchid Plus is a 20-14-13 formula. The MSU WW formula has about the same amount of nitrogen 19%), so you'd use the same amount per gallon. The MSU RO and K-Lite formulas (13.2% & 12.9%, respectively) would require about 20/13, or about 50% more per gallon to achieve the same nitrogen concentration.
The trick in selecting a fertilizer formula isn't the difference in the concentration in the jar, as you'd adjust your solutions accordingly, it's in deciding what ratios you'd like the other ingredients to be!
I like K-Lite, as it is designed to mimic what the plants see in nature. is it perfect? No. Is it good? Yes.
Besides, fertilizer is WAY down the "Maslow's hierarchy" of plant needs, so as long as you feed them, they'll be fine.
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