In your situation, the Reserve is probably the best bet. There's no centurion lounge at ATL, and unless you frequently fly to airports that have one, the extra lounge benefits carried by the Platinum wouldn't mean a lot to you. If you are reliant on the MQD waiver and MQM booster to achieve status, that pretty much seals your choice. For the booster, it's 30K for 15K MQM with the Reserve vs 25K for 10K MQM.