Honestly I’d just say try both and see which one you feel better taking.
I probably lean towards alpha gpc pre due to bias from seeing studies on power improvement, but any choline source pre workout that helps improve your ability to focus on the task at hand should help with better workouts imho.
300-600mg for alpha gpc
250-500mg citicoline
Are my usual recommendations for those two (individually), but I’d also just keep in mind more isn’t always better and when combined with other nootropics/caffeine dosage may be different as well.