I use the standard BA Amex blue for day-to-day use when combined with Tesco and few BA estore.. extra points at Tesco etc .. usually generates enough miles without any real effort for the amount we need (don't MFU when travel as family as we've both got kids from previous marriage so £££)

She doesn't use credit cards just debit (old school) but the last MFU into J has almost convinced her that some credit card benefits are worth it