I have a Nokia 5 Oreo update that takes up too much space in my phone so I'm going to buy a micro SD card to use as adoptable storage ie. use a micro sd as internal storage.
I've just bought a card. Didn't really know what I was doing, so it's Class 10 but only U1, with A1 App Performance. When I installed it, I got a warning to say it was too slow – apparently if I'd bought a card with U3, I wouldn't have received that warning – but it may not actually be an issue. Seems U3 might only be necessary for recording 4K video. If you're able to wait a few days, I can let you know what performance is like.
The card you've linked to doesn't have an A1 certification, but as far as I can tell, that doesn't necessarily mean performance will be any worse, it just means they haven't slapped that particular label on their product yet. ('A1' refers to the card's suitability for installing apps, rather than just storing media.) If you want to guarantee A1 performance and U3 write speed, this one is the same price albeit with half the capacity: https://www.amazon.co.uk/dp/B06XYJNFSB
You could also try contacting Samsung to ask if their card matches the A1 standard.