I started out with Sensi Grow/Bloom. I found that the Bloom didn't have all the sulfur, calcium, magnesium & iron that was recommended for bloom so I went with GH MaxiBloom ( I need nitrogen free cal mag now as the Maxi Bloom has high nitrogen....not sure why). My plants took off after I switched from Sensi to Maxi
I started using AN Big Bud and will add AN Bud Factor X next week. In addition, I elected to go with a different brand enzyme because of cost and reviews that many were similar. The Big Bud has a great reputation as do all of the additions. My buds at week 3 are all over the place and growing fast.
AN products are expensive and I'm quite sure there are alternatives that are just as good from other vendors. Not that I'm not pleased with the AN products. Bud Factor X is amazingly expensive but I'm interested to see what it does and research how something else might be the same thing.
FoxFarm seems to have plenty of additions in this range for much less. There is a guy on Auto Flower Network that uses all the AN line and his grows are massive with buds