Both are alpha tocopherol esters but the succinate is better. Just google alpha tocopherol succinate and you will see how it trumps the rest of the esters used in cancer treatment and prevention studies.
May I ask how your experience was using the PureBulk succinate acid powder? I am interested in using it, just unsure on dosage, preparation/dilution in carrier oil, light sensitivity, etc.
Are you still using succinate? Curious to hear your insights on how things went/are going!