Is it worth it ? - Shops Away

Is it worth it?
I’m looking to buy something and I have two options.
Vendor 1 – Price £469, if I buy through shops away I will earn 3283 FC miles. (5 miles per £ from shops away and 2 per £ on the black AMEX card.)
Vendor 2 – Price £398, if I buy through shops away I will earn 1592 FC miles. (2 miles per £ from shops away and 2 per £ on the black AMEX card.)
Both vendors offer the same delivery, free next day, and both offer the same 5 year guarantee.
So is it worth paying the extra £71 to get an extra 1691 FC miles? (vendor 1 will not price match vendor 2).
Your thoughts please?
I’m looking to buy something and I have two options.
Vendor 1 – Price £469, if I buy through shops away I will earn 3283 FC miles. (5 miles per £ from shops away and 2 per £ on the black AMEX card.)
Vendor 2 – Price £398, if I buy through shops away I will earn 1592 FC miles. (2 miles per £ from shops away and 2 per £ on the black AMEX card.)
Both vendors offer the same delivery, free next day, and both offer the same 5 year guarantee.
So is it worth paying the extra £71 to get an extra 1691 FC miles? (vendor 1 will not price match vendor 2).
Your thoughts please?