The additives are all the same, the pH perfect is in the base nutrients. You don't have to use any other product from AN. You can pick their GMB, Sensi, or Connoisseur. I'd recommend anyone to get the Sensi line, it's the middle grade of the 3.
I usually feed my plants half strength every watering, nothing special about my schedule. I only use 3 other products, CalMag, AN Bud Candy, and Bloombastic.