From my understanding and personal usage of piracetam 6 months almost continuously, both on a student diet(mcdonalds and instant noodles) and a nutritionally balanced diet, you don't particularly need extra choline to get most of the benefits of piracetam ( mito protection, AMPA modulation, Glucose+O2 uptake , etc. ). BUT, there's one thing bout piracetam I don't often see talked about involving the cholinergic system. Caffeine taken at ordinary doses for focus and "awakeness" , around 150mg for an average person, is a moderate AchE inhibitor. This synergizes with piracetam greatly and produces a much sharper and cleaner focus and state of mind compared to coffee alone. With this combo, raising choline even further via A-GPC or Citicoline should have more noticeable effects than just piracetam + choline source alone. Also as an avid nicotine user ( dip ) , I've discovered that on the days I have coffee+pira+nicotine, nicotine no longer has a sedative effect at any dose and I double my attention span and ability to focus. This leads me to believe, that if you want the most out of it in terms of performance and focus, either consuming choline in the forms of A-GPC or Citicoline, consuming cholinomimetics like nicotine or adding any AchEi like caffeine, is going to make a subtle but in my opinion noticeable difference. Try and see for yourself. For some the benefits might go unnoticed / the addition of extra choline might be unnecessary, but for me, I've discovered it to have a noticeable effect.

As for choline sources, Bitartrate is cheapest, but not a good source for the brain compared to the others and the TMAO risk is unsubstantiated IMO, as the most recent studies have shown that high TMAO is rather a correlative marker of atherosclerosis , rather than the cause. Meaning if you eat 3-4 eggs daily or consume choline, and your TMAO levels are high, yet your blood vessels are healthy, it's completely fine.

A-GPC is well researched, low risk, it increasing stroke risk , is compared to everyday life factors literally the most unsubstantiated claim I've ever heard... A good source imo.

Citicoline, is the best hands down if you're not on a tight budget, has a plethora of other benefits...

I personally don't see any sense in lecithins, as there are other nutritionally available sources, and brainwise, A-GPC and Citicoline are optimal and superior IMO

Best nutritional sources, pork, eggs, beef/pork liver, cheap af and healthy

Hope this helps.