Which is better Mizon snail serum or Iunik snail serum? I have dry, dehydrated, irritated, acne prone skin that easily get red (especially after picking)

Mizon snail vs iunik snail

Has anyone use both the Beplain Bamboo Ampule and the Purito Centella Unsented serum? Which one would be better for me? I have dry, dehydrated, acne prone skin that's irritated (from picking acne) and slightly damaged. I've been in adapalene but am about to start tretinoin, so I'm also dealing with some flakyness.

Beplain Bamboo vs Purito Centella

I need help finding a sunscreen. It needs to be... 
MINERAL!! 
lightweight 
Non tinted
No white cast
Not greasy-sticky
Sits well under makeup
Under $30
Easy to find (I live in USA)
Preferably bigger than 1.7fl oz

Sunscreen Help

Hydrating, lightweight, lasted a long time because u only need a little.

LydiaRae