This shouldn't even be a question. GH has been making great hydro nutes for a long time. The lazy man uses Nova. Basically you have to ask whether you want to mix or not to mix. But after having used the Nova series once, and only once, I don't like it. It's easy to get nute burn with it. The PH is fairly balanced but for some reason the Nova burned my plants more often when I followed GH's schedule. The best grows for me have been from using the Flora series, along with Liquid Karma (throughout the entire grow), along with some Super Thrive for transplants and the occasional burn fix. A 1/4 tsp of Super Thrive (available at any gardening center) per gallon is a perfect elixir for those plants that look like they're hurtin. They'll be back to their healthy self in a day or two. I have been using
http://www.advancednutrients.com/hydroponics/products/connoisseur/connoisseur_product_information.php connoisseur for the bloom stages and OH MY LORD OF POT, this stuff is a miracle.
I think I'm going to change over to Advanced Nutrients for all of my new grows. Only problem, I can't find them at my local store, I have to order online to get them. Kinda expensive, but holy weed they're awesome. After my next grow is harvested I'll let you know how it works out. But honestly, GH Flora is way more consistant than Nova. Just watch the schedule that GH gives you and keep the seedling schedule about 1 week into mild growth. If you use their "mild growth" schedule too early you will burn the crap outta your babies. I usually stick to after the first branches with 5 leaves pop out switch to mild growth schedule for about a week maybe two depending on the strain (indicas seem to kinda like nutes more than the sativas do at a young age), then go right to Veg. schedule. Don't worry about all the rediculous additives that are sold out there the 3 part flora, with a stimulant like liquid karma is honestly all you need for a decent grow, and if you're just getting started growing it's the best, most reliable "starter kit". I really don't know too many people that use it that don't love it. And of those people NONE of them will use Nova. My two cents.