I can only speak for the Dexcom based on personal preference as I don’t personally use the Tandem pump, but it is fantastic. No calibrations and the 10 day wear time is super nice, and it’s definitely accurate with no calibrations. From a professional standpoint, we have a ton of patients who use that combo and do extremely well. The hybrid closed loop system should be really nice for exercise too. There’s nothing wrong with the medtronic combo, but overall the Tandem/Dexcom combo is probably the most efficient on the market currently.