I like dexcom because you can calibrate it, but there are software add-ons that allow this for libre. Also dexcom customer service is superb (disclaimer I am in New Zealand), you can ring them 24/7 for help.
I'll be honest, what I've learnt about the UK dexcom ONE hasn't overly impressed me, not sure if you can calibrate it? Google is leading me to the NZ version of dexcom ONE, which is a cut down version of the G7, has optional calibration, and something I would happily use if I didn't need the pump functionality of the G6, G7.
But honestly, different people prefer different sensors. You could certainly try the dexcom out? I've been very happy with the dexcom.