Samsung used to the the gold standard for SSD upgrades but that seems to have changed. We see more issues than before with them. On the other hand, we see very few issues posted about Crucial and OWC SSDs used in Macs. I have an OWC 500GB in my 2012 MBP-13. It made the computer a pleasure to use again.
The other factor is support. Even if you buy directly from Samsung, you will find their support slow and not very helpful. It can take days to still not have a viable solution.
On the other hand, every question I've asked OWC over the last 15 years received a useful response in 24 hours of less.
This is the OWC SSD page for your model. The "Pro" Model has a longer warranty: https://eshop.macsales.com/shop/ssd/owc/macbook-pro/2011
Two things:
1) Your MBP was the first to have a 6GB/sec SATA drive bus. Buying a 3GB/sec drive will leave a lot of performance on the table. Go for the 6
2) When servicing or changing drives in 2009-2012 MacBook Pros, best practice is to change the drive CABLE at the same time. The cable is, in fact, a thin flexible printed circuit board that suffers a circuitous routing over sharp edges on the chassis. After 3-5 years of the vibration of normal use and transport, the cable's insulation can chafe and expose the traces. Symptoms of a worn cable can mimic symptoms of a failing hard drive.
The cable is cheap (~US$18); available (here); and easy to change, especaily when you are changing the drive anyway.
EDIT: Just noticed you quoted prices in Pounds. Did you check with OWC resellers in the UK?
https://www.owcdigital.com/reseller/resellers#reseller
If you can get the Crucial cheaper, that's fine with me. I don't think Crucial have the cable but Amazon does. However the AMAZ cable prices vary. I would not pay over about £14 for a cable.