Best Grass Seed – What Is The Best Grass Seed?

What kind of grass seed is this, and is it best for my lawn?

I was hoping I could attach a picture of my grass- but can’t figure out how. From what I have read, it looks like a Kentucky Bluegrass- beautiful thin dark green uniform blades. I have a daycare in my home and my yard gets a TON of foot traffic. I live in Vermont, so it gets very cold in the winter,  Can I plant Bermuda common seed in my area, if so when is the best time to do so? and can get very hot in the summer. I need to reseed my lawn as the seeding we did last spring was not done with a seed with a lot of clover. Live and learn. Now after we got rid of the clover we have a ton (and I mean a ton) of empty spots. My yard has full fun for a good portion of the mid-day and all afternoon. I have fenced off 1/2 of the yard so I can keep it untouched by kids while the grass really establishes itself. I was thinking of renting a aerator to loosen up the top of the soil. The yard is too big for me to rake on my own.
Questions:
1. I love the look of the KBG. Is this an appropriate durable and resilient seed for my yard? From what I have read, KBG will spread, which is a good thing in a yard like mine.
2. Will the aerator help, or is there an easy way to loosen up the top of the yard?

Thanks for your advice!!