I found a hydro shop nearby that sells Roots, I'm going to check it out soon.
So, by adding the coco it makes the waterings easier I gather? Which would mean more nutrient uptake?
Think of coco coir as a sponge. You can put a sponge in a small bowl of water or a swimming pool and it will still retain the same amount of water, just like coco coir. As a result, coco only retains what it can hold and everything else typically runs off. As a result of this, over-watering with a mostly coco medium is pretty much impossible. My plants have been healthy since day one of going into this mix without any signs of over/under-watering or over/under-fertilizing. Coco coir is awesome and personally, my results have been astonishing since I've mixed it with Fox Farm soils.
Anyway, to answer your original question about comparing both soils, my personal opinion is to use both soils if possible. I used to use pure FFOF and, like many before me, found out the hard way about combining their nutes with their soil without proper caution. I still loved FFOF, but the absolute best growth that I've ever experiences is when I cut the different fox farm soils with coco coir. If you can only use one, FFOF will likely best serve you in the long run. But if you can, try mixing a coco coir block with a little under half of a bag of both the Ocean Forest and Happy Frog soil mixes, then throw some perlite in there as well. If I had to put numbers on it I'd say about 40-50% coco, 15-20% of each FF soil mixes, and about 10-20% of perlite. I keep saying about because I usually just wing it
Anyway, there are plenty of good reasons to do this. First off, OF and HF have different ingredients in them. OF has some seaweed and kelp and other things of that nature that aren't included in HF, however HF has mycorrhiza and other beneficial microbes in the soil that OF doesn't have which is why I like to mix a little bit of both with the coco. I like to use mostly coco because the coco not only seems to be more efficient with water/nutrient retention than either of those soil mixes, but it also seems to be more forgiving to the beginner like myself
If you can mix both with some perlite and coco, do that and you'll be amazed at your results. Or even just try both OF and HF, however if those options aren't in your budget and you can only go with one soil I would recommend the OF for sure. Hope this helped some, best of luck!