I bought some jeans from M&S yesterday so I had a look at the advent calendar. In the store they have a little display of all the contents. The sizes are small - samples and travel sizes really - but the stuff I like is stuff that I already have full bottles of, so the AC isn’t as good value as it seems.
The JL one is perfect for me - higher end and full sizes, so it feels like a real treat. M&S feels like paying for samples.