I have one router in my house. As the house is big we don't get wifi signal in other rooms.
So, Should I buy a new "Router" or a "Router repeater" to extend the range the of WiFi? Which one will be most perfect?
Last choice is a wireless extender, period.
First choice is Ethernet cable (but often that is difficult) An Ethernet cable through the attic with an access point attached at the other end is ideal.
Between those two lie two methods to extend the signal using other stuff in the house -- TV cables and power circuits.
MOCA is somewhat limited in that you need to proper cabling to use it.
That leaves us with the powerline adapter. First,
ONLY use AV2-1000 or better adapters.
They do come in kits in which one plugs in next to your router and the other plugs in at a dead spot and has built in wireless, like
THIS for example. I say only use AV2-1000 or better because those units get right around 200Mbps, much like wireless never can reach its theoretical target -- marketing.