There are a number of good brands. Directions will vary a bit with the potency since some are more concentrated than others. I can certainly advise on using any two part you elect, but I've not seen reports from folks using a Live Aquaria brand.
IMO, ESV and Tropic Marin Balling are excellent choices.
What is desirable about mixing similar to my DIY (BRS uses my recipe)?
Nothing really. Creature of habit I guess. I was curious. I have been using BRS BRAND CAL/Alk for over 10 years. But they have sky rocketed the price so I need to change. I wanted something similar I can mix for a gallon stock solution for my dosing pumps.