Looking at getting Spectrum cable but having spec difficulty.

They will provide a router only, router with wifi or router with wifi
and phone but cannot give me specs.

What's my problem ?
I currently have AT&T WiFi Router that does not have much power out and
seems to drop WiFI or internet or ??? often. My security cams turn off
and the app shuts down. Bad app too !

If I use WiFi Analytics WiFi app on my laptop it shows the AT&T WiFI at
"Max Rate" 150 where another LAN WIFi router at the other end of the
house shows as "Max Rate" 300. I cannot watch movies from the back
room PC where the AT&T WiFi is to the living room PC using their wifi
since it stops and stutters. Using a cable down the hall works perfectly.

Several questions.
What feature should I be looking for in a WiFi router:
Speed 300 vs 150 "Max Rate"
Power output
Dual freq 2.9 vs 5 GHz
AC protocol or whatever it is called

Spectrum says it installs an Arris TG1672G but it does not specify
output power in the specs I found. Anyone have a better spec source ?
I am not even sure that is the WiFi modem router that I will get as it
seems they grab whatever is handy to bring out to install.

So I hate to think I would have to set up my own WiFi Router.

Last question -
If I get internet only and want phone service, what are my choices ?
And would that service be able to take my current land line phone
number and use it ? I would totally drop AT&T if so.
Does that service have caller ID - mandatory feature for me to have.

Also is there a preferred Channel ? 1 or 6 or 11 or ???

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