Does the xb7 have better range than the xb6? How are the pods?

I have some deadzones in my house.
End of house, basement, but mainly back porch and driveway.
Cant move modem.
Have an xb6.
Does the xb7 have better wifi range?
How are the xfi pods?
Will putting them near the exterior of my house increase wifi outside but maybe decrease speed inside?
I was going to just grab a single tp link wifi extender from amazon but need more than 1 bc dead zones are at opposite ends of the house so i think multiple mesh pods would be better...