What are you basing this off of? I can find you a ton of literature work saying choline sources are worthwhile for a variety of different disorders. The amount of work you'll see about choline in young healthy individuals is limited (but out there), but I find it incredulous someone could use a study or two (harvard or not) and base their assumptions off of that.
Isn't the point of supplementation supplementing your diet? If someone was perfectly fine and had everything from their diet, then why would they supplement something? CDP choline and all the other choline sources are all used to serve one purpose. Think of it the same way you'd think of sources of creatine...why are you supplementing creatine? People use all sorts of different creatine products but in the end, the end goal is the same, increasing PCr.
I am not denying CDP or A-GPC are better, in fact, if the cost was justifible, I would use them, but to consider them significantly much more effective at achieving the bottom line than the salts isn't exactly fair thing to say considering all my points above and the large body of working confirming choline being helpful in many disorders associated with poor cognitive function. Like I said, I like them and am not trying to say they are worthless, just not worth the price.
Also OP, I forgot to say last time, gram for gram, citrate has more choline than bitartate if I recall correctly. Cheers.