All of the above mentioned CGs are great places - some with great costs, both financial and non-financial (limiting factors). Choosing a location is a balancing act between location, cost, hookups, scenery, availability, rules, site size, etc.
We landed at Smuggler's Den on the west-central portion of the island. Although I would have loved to see the sunsets from my site like you can at the KOA, I didn't want the $140+/night cost. I can see the sunset for free, then travel back to my site. I would have loved to be closer to BH (BH Campground), but the "no reservations" limitation didn't work with my schedule. I would have loved to be lost in nature (Acadia NP), but I travel with others who require electricity (no generator here), so that is not an option. I would have loved being away from it all (Schoodic) but our group enjoys being a bit closer to the action.
Bottom line, find your limitations, do your research like you are here, and pick the place that has the definites that you can and can't live without.
Out numbered 4:1
2011 F350 PSD 6.7L Dually
2016 Cedar Creek 36CKTS
Empty Nest'n with our Rott!