Is there anyone who knows a lot about Physiogel products?

My skin has been itchy and I've been getting a lot of breakouts lately, so I'm looking into changing my skincare products.
I've noticed that many people say they received recommendations for Physiogel products from dermatologists.
Physiogel products are so famous that I thought I should give them a try.
I'm thinking of taking this opportunity to buy one!

I went to Olive Young this holiday and checked out the Physiogel line.
There is a blue product, and I noticed there is a red product called AI Red Soothing.
I was going to buy the red product thinking it was for acne, but
Also, I was debating whether to buy the lotion or the cream!

By any chance, are there any people who use a lot of Physiogel products?
Please recommend any Physiogel products that you think are a must-have!