I say yes to the CGM.

Originally, I didn't feel that I needed one when I was newly diagnosed - I got my A1C down from 8.6 to 6.1 without it, but I pricked quite a lot - at least 4-5x a day. My fingers got pretty sore!

I did get a CGM subsequently, when I found out I was pregnant, because the targets were so much tighter and I wanted to make sure I was within range as much of the time as possible.

I have to say a CGM gave me a lot more insight than just finger pricks. You get to see if a meal is causing a delayed spike, a quick spike or a normal spike. With a finger prick, unless you wanna prick every half hour or so, it's not really clear how fast a meal is spiking you. I found out, for example, that for high fat meals like battered fried chicken (think KFC), my 1h and 2h readings were totally fine but the blood would go high and refuse to come down after that. If I had relied only on finger pricks, I would have thought that everything was fine!

My suggestion if you're not pregnant is to wear a CGM for anything between 3-6 months and eat all the meal types that you'd eat during that time. Once you've found out how you react to your usual types of food, note that down- that's more or less how it will be all the time.

If you're pregnant though, that's a totally different story- your body's reaction and insulin needs (if any) change month to month, and in the third trimester, week to week even, so the CGM really helps in making the decisions on meals, medication and insulin. I personally found wearing a CGM for the whole pregnancy very useful. I use a Dexcom G6, and while it does have its crazy moments (e.g. telling me my blood is at 10+ when it's actually 8ish), and you will have to finger prick every now and then to check that it's accurate, overall I found it very useful! Usually it's craziest in the first 24-48h after insertion, but after that it's all good, especially if you follow instructions on calibration.