Just my own experience:
My local Happy Hydro store was out of
Happy Frog I have been using the last few years so I had to use
OF which the person running the Hydro store said was too hot. I mixed it with Promix HP about 50-50%. It might still not be the best. I started my seeds in a shot glass with a few drops of H2O2, filled the top of my container with an inch or two of straight Promix HP to plant my soaked seeds in.
The Hydro shop recommended Roots instead of Ocean Forest but I've never used it and they were out the day I was there.
I've still been running into some minor issues I suspect is from my well water which seems to have had it's ph number rise from last year and I haven't been able to get it dialed in. I'm currently in a drought or I would only use rain water harvesting usually.
If you grow outdoors I think it is better to build your own soil and build it with compost, worm castings, composted cow manure, Canadian Goose manure and grow straight in the ground. I also mixed in bagged top soil and used potting mix from pots every Spring. When I grow straight in the ground I don't use any nutrients other than manure and have had no issues with over watering, nutrient burn or even using my well water straight from the hose.
I've got 75 seedlings coming up now from my outdoor plot just from raking up the soil bed and tossing a handful of seeds onto the ground and raking soil over them. I don't plan on doing much more than turning on a sprinkler if I don't get rain often enough and thinning out the grow a bit. These will be from a strain I ran a seed run on last year where I crossed a very small strain called Azure Rocket with a Northern Lights strain. Azure Rocket doesn't get taller than 18 inches.
I have never managed to get any of my weed seeds to sprout from Jiffy Pellets. I wouldn't plant seeds I bought in them. Seedbank seeds are too expensive to chance in Jiffy Pellets for me.
I can't get worm castings anymore though. I use to pick up 160 lbs for $16.00. Place apparently closed down, heard the guy died and his wife closed it down a few months ago. I had to start using Canadian Goose droppings from the geese that invade my yard. I top dress my plot with it and have had no issues with it being fresh from the goose.