Vitamin C Product Recommendations

Hi everyone! I have everything else in my skincare routine down except for my vitamin C! Preferably a serum but the philosophy mix in powder seems really interesting also. What are your holy grails? See image for the 3 l'm deciding between currently, but open to all suggestions.

Is there a concentration or specific formulation that is best? Trying to stay around 20-ish% and primarily as ascorbic acid. If relevant, l'm 29F with non-sensitive skin so really looking for potency. Totally new to looking vitamin C seriously so any insights and product suggestions are appreciated!