If your main goal is to get low sugar alerts i agree. But even Dexcom may have some bias and introduce some false / missed alerts, so it depends on what accuracy do you need with these alerting system.
The higher data resolution the Libre 3 provides out of the box is nice but, doesn’t make a big difference to me. But not having to remember to tap the device every 8h is a big plus!
As i know Libre 3 does not provide 1-minute raw data resolution for a full day, they provide it if the app is running and being connected to device to get some last samples from memory, i see people reporting they have a lot of gaps in these 1-minutes values in csv exports. In contrast Libre 1 allows for whole day raw data without gaps, but you need to tap 3 times. I agree that it is a big plus with Libre 3 that you dont need to tap often, but that results in raw data loss, so you significantly reduce your sample size. But if your goal is to get low sugar alerts that doesnt matter for you, so not a big deal.
Also i would note that Libre 1 usually costs 2 times less than Libre 3 
Libre 1 can be reset without taking out so you can use it for 2 more weeks (my record was 6 weeks then battery and measurements went off) but V2 and V3 cant be restarted.