I’ve been using the Dexcom systems since 2009. I would not willingly choose to live without it. I find it invaluable in helping me to time meals, insulin doses, and carb corrections. I live alone. Dexcom’s ability to independently speak up at any time of the day or night is an endearing feature. But it can also be a nuisance and you do have to defend against alarm fatigue.
While I have not worn the Freestyle Libre, I’ve read many comments online. I think it’s way better than finger-sticking, when accurate. I think the Libre is like Amazon’s personal electronic assistant, Alexa. She will not speak unless you make a request. That is both good and bad. On the good side, you will not suffer any alarm fatigue, as Libre raises no alarms. On the bad side, Libre will hold its tongue while you crash into a hypo mess.
If money is the determinative factor with you, then I’d go with the Libre. If you can afford it, I would recommend the Dexcom. Dexcom allows customizing almost all the alerts and warnings so you can manage or prevent alarm fatigue.
Both of these devices will teach you, if you pay attention, how your glucose metabolism works. This is a huge benefit as you can learn all the tactics to not only make yourself healthier but also safer. In any case, if you make a poor choice for yourself now, you can always get the other system later. Sometimes you just have to try it to know what you can live with. Good luck!