Too many to list but I only carry two in my wallet.
Main use – AARP (5%)
Backup – BOA CR (2.5%)
How much do you spend on your cards. AFAIK AARPs real benefit is 5% flat over six months with no signup bonus, if this is the case you'd have to spend >$10k on this card alone (over the first six months) just to break-even (compared to other cards when you consider the signup bonuses), and then you'd have to get another AARP every six months just to reset the 6-month counter for 5% bonus. now worth it IMHO.
Compared to another card (Amex 50k, Chase 50k etc), you get 50k for purchase (after spend requirement), and then you get points for spending, and ontop of that you get all the protections (which I dunno if the AARP card gives you), and those points are worth more than 1cpm. Not worth it IMHO.