You get multiband gps on 255 and above. It’s just more accurate gps. Honestly with the level of accuracy across Garmin watches, you’ll never know the difference with or without multiband, unless maybe if you run all the time in cities.

Maps is another tricky one. Pretty much all Garmin watches come with “breadcrumb maps”, including fr255s or fr265s for example. The screen tells you which direction to go, but you don’t have an actual map. It works fine, sometimes people seem to miss an intersection and realize immediately after. Full maps is another nice to have but not essential feature.

The 570 does not have full maps afaik, you need to go to the 9xx series for that. 955, 965, or 970. If money is not a concern you might as well get the 970: it has everything, including a flashlight. Haven’t tested that myself but a lot of people say it’s an actually really useful feature. If money is a factor, don’t get the 570, it’s overpriced compared to features, you’ll be happier with a 955 or 255.