How bit is your house?
I had a problem with an upstairs with poor reception. In the past I used a "repeater" there, but the problem is that you had to select it when upstairs as if it were a separate system. My wife sitting in a chair a few feet from the stairs kept having her Iphone and Ipad try to connect to the upstairs and got poor reception. The Orbi , with a base and another "node" upstairs solved this since it broadcasts the signal but is still part of the same system. You can use your cell phone on the internet as you leave the room and go upstairs with no glitch and both up and down stairs gets great signal strength. No reclogging in to a repeater system.
It is expensive and if your house if smaller or you had better sense than to run the internet into the end of the house in the master suite [guilty] then you might not need a whole house system. Orbi is not a truly integrated system, but it has a channel reserved just for communication between the two and works well unless you have a really spread out house with porches, basements and upstairs etc. If you have a sprawling configuration you might need a system with several nodes that operates as one system to get good signal with no interference. Google has this and there are others, search on Amazon.
My daughter lives in a small house in California [not small for out there] but has an upstairs and since the house is about 1900 sq feet she replaced her old Apple airport with the airport extreme and it works fine all over the house.
There is no one answer to everyone's situation.
P.S. I now have Cspire fiber and it is much, much faster than Comcast.
Good luck