The "im on phosphatidic..." thread? If you had a read of it from the start, it wouldve been prior to soy lecithin granules hitting the scene, plus guys were probably talking about an older version of King.
There's pros and cons to either option here (ie running a PA concentrate, vs a PA source like soy lecithin granules).
Personally, just to minimise confounds, and to see if you wil enjot PA, and if money is not too much of an issue, Id recommend running a concentrate for a month or two. Id recommend purchasing a product that specifically lists 'Mediator' as an ingredient; that way you know how much PA you will be getting per dose of the product.
After that, if you like the stuff, maybe trial soy lecithin granules.
Trying a Mediator PA supplement as an introduction to PA does seem like a good idea. From there you can see how the lecithin compares and play around with the dosing. I wouldn't say it's necessary, but, if nothing else, it'll add some sample size to the concentrated vs lecithin comparison.
Edit: At least for regular use, I'd rather take the money I save from going with the granules and spend it on other supplements and/or food. The cheapest PA product that lists 750mg is around $2 a day; with the money you save by going with the granules, you can add some more useful supplements to your stack. If you're running higher doses of PA, with the cost of concentrated supplements, I hope you have a lot of disposable income.
For what it's worth, PA and HMB-FA (along with frequent workouts) is An incredible combo. I've been consistently hitting PRs basically every workout with PA, and the HMB allows me to work out more frequently, so I can set more PRs, and make more progress, in less time. I'm taking both now, and just looking to add in a good joint supplement or two, since frequent training with a bit of volume can make my joints a bit sore.
My ideal stack (this summer) is likely going to be:
-PA (at least 3tbsp granules)
-HMB-FA
-Joint supplemement(s)
-Staples (creatine, betaine, beta alanine)
I'm not positive on what I'm doing for the joint stuff yet, but I do really like cissus, and I picked up a supplement with 1.5g glucosamine, some chondroitin, and MSM, and also some bromelain to go with it.