With the caveat that these are this years favourites - I like trying new stuff and don't tend to have long term loyalty often.
Sunday Riley CEO Vit C Afterglow - lovely brightening cream on a morning. If you don't have dry skin it would also be fine as your only moisture layer.
MediK8 Press and Glow Toner/ Glow Recipe Watermelon Toner - I love both these, they serve the same purpose and it's difficult to say which I like best. The GR has a bit of viscosity so can be applied by hand but the MediK8 is thinner and the press down style of the packaging means you need a cotton pad.
Glow Recipe Plum Plump Moisturiser - Got this as a 10ml mini and didn't expect to love it so much as it has a bit of a gel cream texture which normally doesn't work for my dry skin. However it's lovely and I'm a bit obsessed, it soaks in really well and the finish is a bit like Tatcha's Dewy Cream but quite a bit cheaper. I also like that it doesn't pill on top of other products or under sunscreen.
Kate Somerville Goat Milk Cleanser - Again got a mini of this to try. The first time I used it I wasn't keen on the smell but either I was having a delicate stomach day or I just got used to it because now I love it. I like to use a moisturising cleanser on an evening and this has now knocked Glow Recipe Avocado Cleanser from the top spot. I would still buy the GR cleanser though if I couldn't get KS on offer as KS is expensive as cleansers go.
Dermatica Glycerin Cleanser - I like to use a glycerin based cleanser on a morning and as yet I've not found one I like better and it's fairly affordable (also gets discounted often).
Summer Fridays lip balms and lip oils - really like these, lovely texture and lovely sheer hint of colour.
Estee Lauder Night Repair serum- I'm very late to the party on this, got a sample size and absolutely love it. I'm probably just the right age now for this to hit the spot.
Sweet Glass Skin Foundation - Really love this, it works exactly as described and is exactly the type of finish I like, medium buildable coverage, not matte but not too shiny. It lasts well on my nose (problem area).
Ouai St Barts Body Wash - Another sample size, I love the smell - it's pina colada's on a beach.
Pureology Shampoo & Conditioner - Really suit my hair type, smell lovely and you don't need to use a lot. Quite expensive but seem to be on offer somewhere most of the time.
Elemis Pro Collagen Vitality eye cream - I like this a lot and I do think it's firmed my eyes a bit (whether that's just regular application of something I don't know). Despite this I'm unsure whether to repurchase because I think it's very expensive.
Elemis Pro Collagen Marine Cream - Another Elemis 'I really like this but' product. The cream is lovely but it is expensive and it doesn't layer well with other products. I enjoy skincare layering so this cream might be better suited to someone who wants to cleanse, tone, moisturise and go. If I was going away for a few days and planned to take very few products I'd probably take this as it's rich enough to double up as night cream too.
Those are my highlights of the year. I know you said only one or two but I have a day off and I love chatting about this stuff!
Edit to add - Suqqu Aquafons lotion - Got this in the Liberty Beauty Drop, very hydrating, adore the smell. It's just very expensive for 'fat water'.