Which is a better purchase

Hey everyone, I have a 20% off coupon for detailed image, I have everything I need but was debating on either getting another opticoat kit or sonax perfect finish? Both come to $55, which would you pick

 

Which one would you use more of get that one.

 

Yea that's true and both would kind of be the same, I would make more from the opticoat though, plus they aren't shipping the pf out till the 26th and I don't want to wait that long for my order