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Hi Stephen, thanks for your question.
Any of the three toner cartridges on the page you are on will work fine. The difference between them is that the top 2 are TonerGiant brand and the bottom one is Samsung original. The product at the top prints 3000 pages but the other two print around 2000 pages.
https://www.tonergiant.co.uk/model/Samsung-ML-2010R-toner-cartridges/
If you need any more help, let me know.
Thanks,
Stu.