I used to have the basic Avios Amex, but switched to the Platinum Cashback (£25 per year, 0.75% cashback up to £10k, 1.25% after £10k per year).
I found I got more value for my money with the pure cashback one - say on average you spend £15k a year on that card, you will get £137.5 back (=112.5...