I use Dyna-Gro, it’s a good 2 part nutrient system, with the addition of their Protekt it’s 3 total bottles, Protekt & Grow for Veg, Protekt and Bloom for flower. Very simple and easy, no fuss. For a year of nonstop growing it cost me $120 total or about $10 a month to maintain 30 gallons of total reservoir with weekly changes and top offs.
Lots of growers here use Megacrop, it’s a good 1 part dry nutrient and is one of the most cost effective.
I’ve read good things about Jack’s nutrients, similar to Megacrop but they split out the Calcium and Magnesium. I think if I ever decide to switch from Dyna-Gro, Jack’s will be my choice. Very cheap to run.
At the end of the day most of the nutrient lineups do the same thing, it’s just about how many bags or bottles a particular lineup requires. I like to stick to 2-3 bag/bottles for ease of use.