# This or that, answered

> Desk-researched head-to-head beauty comparisons with specifications, UK prices and “choose this if” verdicts. Not lab or hands-on tested; inclusion is never sold.

- Canonical: https://thecastindex.com/beauty/vs
- Author: Kaiser Khan (Founder & Editor)
- Updated: 2026-09-25

## [Crystal Retinal vs The Ordinary Retinal 0.2%](https://thecastindex.com/beauty/vs/medik8-crystal-retinal-vs-the-ordinary-retinal)

- Option A: Medik8 Crystal Retinal
- Option B: The Ordinary Retinal 0.2% Emulsion

Choose Medik8 Crystal Retinal if you are new to retinoids or want a graduated route: six strengths from 0.01%. Choose The Ordinary Retinal 0.2% if you already tolerate retinoids and want high-strength retinal cheaply — £15.20 for 15ml, against £104 for 30ml of Medik8’s equivalent 0.2% strength. Both are evening-only.

Markdown: https://thecastindex.com/beauty/vs/medik8-crystal-retinal-vs-the-ordinary-retinal.md

## [C E Ferulic vs C-Tetra](https://thecastindex.com/beauty/vs/skinceuticals-c-e-ferulic-vs-medik8-c-tetra)

- Option A: SkinCeuticals C E Ferulic
- Option B: Medik8 C-Tetra

Choose SkinCeuticals C E Ferulic if you want the most-studied form of vitamin C — 15% L-ascorbic acid with vitamin E and ferulic acid, fragrance-free — and accept £169. Choose Medik8 C-Tetra at £45 for a stable, water-free oil with 7% tetrahexyldecyl ascorbate. Both go on in the morning, under sunscreen.

Markdown: https://thecastindex.com/beauty/vs/skinceuticals-c-e-ferulic-vs-medik8-c-tetra.md

## [Relief Sun vs Birch Juice Sun Cream](https://thecastindex.com/beauty/vs/beauty-of-joseon-relief-sun-vs-round-lab-birch-juice)

- Option A: Beauty of Joseon Relief Sun: Rice + Niacinamide SPF50+
- Option B: Round Lab Birch Juice Moisturizing Sun Cream SPF50+ PA++++

Both list the same four UV filters and SPF50+ PA++++, so choose by texture and ingredients. Pick Beauty of Joseon Relief Sun for a dewy, fragrance-free cream at about £15. Pick Round Lab Birch Juice for a more moisturising cream on dry skin, at £21, accepting chamomile and pine-leaf botanicals.

Markdown: https://thecastindex.com/beauty/vs/beauty-of-joseon-relief-sun-vs-round-lab-birch-juice.md

## [Dior Lip Glow Oil vs Rhode Lip Treatment](https://thecastindex.com/beauty/vs/dior-lip-glow-oil-vs-rhode-peptide-lip-treatment)

- Option A: Dior Addict Lip Glow Oil
- Option B: Rhode Peptide Lip Treatment

Choose Dior Addict Lip Glow Oil if you want shine with a choice of colour — 19 UK shades from sheer Juicy to saturated Glaze — at £34 for 6ml; it contains fragrance and menthol. Choose Rhode Peptide Lip Treatment for untinted, glossy conditioning with peptides and plant butters at £20 for 10ml, fragrance-free in its unscented version.

Markdown: https://thecastindex.com/beauty/vs/dior-lip-glow-oil-vs-rhode-peptide-lip-treatment.md

## [Airbrush Flawless vs Double Wear](https://thecastindex.com/beauty/vs/charlotte-tilbury-airbrush-flawless-vs-estee-lauder-double-wear)

- Option A: Charlotte Tilbury Airbrush Flawless Foundation
- Option B: Estée Lauder Double Wear Stay-in-Place Foundation SPF 10

Choose Estée Lauder Double Wear if you want oil-free, non-comedogenic, fragrance-free long wear and the widest shade match: 60 shades, natural matte, £39.50. Choose Charlotte Tilbury Airbrush Flawless for full coverage with a blurred soft-matte finish in 44 shades at £40, accepting menthol and no SPF. Re-match either: both changed formula recently.

Markdown: https://thecastindex.com/beauty/vs/charlotte-tilbury-airbrush-flawless-vs-estee-lauder-double-wear.md