I always recommend molasses if you have proper temps for it, and keep a close eye on your solution and it's pH. Molasses can cause stuff to go screwy if temps aren't under 73 in the water. In soil containers, molasses is always fine. You can pick up some floralicious. I highly recommend that, but not floralicious plus, although it is amazing, it is not good for flushing. If you don't mind buying both, then get both, but always remember how much money is going in, and how much bud is coming out of this project. I would just start with plain old floralicious.
Of course, molasses is way cheaper and works fucking amazing. I use molasses a lot, but I also use 3 other carbohydrates for different reasons, I also have a 4th that I am all out of right now, and a 5th when I'm flushing, because Clearex also contains carbohydrates.
I use molasses for brewing teas and as a general pick-me-up for well rooted plants that don't have the same vigor as others. I use Liquid Carboload for tea brewing as well, but this is mainly my all-purpose carbohydrate because all the complex goodness in it, plus it is very stable. I use Sweet Raw anytime I want to use molasses but I am concerned about temperatures; Sweet Raw is all derived from molasses, but it's much more stable and soluable, but it doesn't have all the same goodness in it, but it's close... if Sweet Raw isn't available Sugar Daddy is the same shit. During my last few weeks of flower, and deep into the flushing stage I use a local product called Sparks, which visibly gives me frostier and fatter plants, more so than anything else. And sometimes in the last few days of flush I use Clearex, not always, I don't always need it, and flushing agents always leave a little bit of harshness in the smoke... well, not always, but often enough if you don't take care while using them.
You can seriously get away with just 1 carb supplement. I just us so many because I have so much excess fertilizer laying around from trying different line ups. Also, considering my weekday job, I am constantly gifted stuff like this from Venders that come into the shop.
The Sparks is goooood stuff though, I can't wait until this guy goes national so you guys can try it too.