I wanted to try the next step up from the 3part and was going to get Sensi Grow and Sensi Bloom but they were out of the Sensi Bloom so I got the Connie Bloom and the Sensi Grow. The Connie is supposed to be another step up from the Sensi. Now I've bought the 3part again and am just using up the others until they are gone. The 3part worked fine for 14 years and I didn't see any drastic improvements with the 2part stuff.
I saw huge improvements when I started using Big Bud so will always use that. Just tried the Bud Ignitor and the jury is still out on that. My current plants were grown from seed so not good candidates for comparing results with. Have enough left to try again on a few plants that will be clones from the same mother to get a better comparison. The guy that recommended the Ignitor also recommends the Bud Factor X for bigger buds and more resin.
I like to keep things as simple and easy as possible. Too many supplements complicates things and if all you get is another 5% then it's not enough to convince me to spend extra money or extra thought on it. I never used CalMag until a few years ago and never saw any deficiencies but use it now in small amounts just in case and it's cheap enough not to concern me. I'm not happy with the GrowTek one I have now so may buy the AN one to replace it. It has a lot of amino acids in it and the plants and I like aminos.