I get the powdered BB. Keeps for ages compared to the liquid and the big jar I got, 500g I scored for $80 and it would make about 4gals of the liquid. Wish all their nutes came like that. Would save a ton getting them shipped but I won't need any for a couple years at least.
They are totally different products to be used at totally different stages of flowering. BB is 0-15-35 with 10% Sulfur, 20 amino acids, ascorbic acid, (Vit. C), and citric acid made to kick flowering into high gear and force more bud sites and you quit using it just after half way through flowering.
OD must be made out of bog water and did absolutely nothing to plants I grew side-by-side without it. It's 1-5-4 and 1% Mg and is supposed to boost resin production the last 2 weeks before flushing. This is one of the useless yet expensive supplements that the AN haters bitch about and I'm on board with that. Many of their supplements are like that. Just more of what's in the other ones and everybody I know that has gone with the whole line ends up screwing up their grows big time. The 3-part base nutes are the same price as the crappier GH nutes and have built in supplements like Wet Betty, Fulvic and Humic acids and worry-free pH Perfect technology that I know from 5 years of using it works pH Perfect in hydro and soil/soilless growing. They also didn't hide behind flowers and veggies to sell their products but proudly announced from Day 1 that they made nutes for pot and have been shut out by all the mainstream nute makers and advertisers since. Just for that they deserve my money over the rest plus they are Canadian first and now make them in the states too.
Once I get my DWC tubs up and running I'll be testing out that Bud Factor X using identical clones from the same mother in two tubs. Everything will be identical except one tub will get the Bud Factor and one won't. It's added in early flowering along with the BB. I'll be doing a grow journal about it too so keep your eyes open for that.
Something I've been doing is to grind up a couple of my zinc citrate tablets and add to the nutes as I believe there isn't enough Zn in soils or nutrients. I also toss in a couple of iron tabs, 2 caps of complex B and a couple of 1000mg ascorbic acid tablets. Not sure if it makes much difference but I take them to keep me healthier and in the case of zinc it's an important catalyst for many of the complex chemical reactions that go on in both plants and animals.