20 vs. 21 samples

[sneek]

I have 64oz of both 20 and 21 but I plan on giving someone a sample of one of them. I have no idea how the surface looks but it is on a rare red S10 blazer

I am thinking about giving this person 20 over 21 because it 20 has more cleaning ability possibly making the surface look better. any oppinions are welcome

[sneek]

mm got to decide in the next few mins but i think i will go with #20