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Get the second or third one as they are the most recent 'AC' wifi protocol.
Usually there will be an option when setting up to clone your router's existing WiFi network automatically, then the ID and password will be the same for all wireless access points, and any modern device will just connect to the best one as you move around.
(It can be useful to use different IDs when troubleshooting coverage though.)
Also, double check that your main router is AC and transmitting on both 2.4GHz (slower, longer range) and 5GHz (faster, shorter range, blocked by walls).
No WiFi thread so...
Our Virgin Media router is in the living room and most WiFi is consumed there I'd say, but getting weaker signals in the kitchen/bedroom probably due to the massively thick brick walls. would one of these sort it out?
http://amazon.co.uk/D-Link-Universal-Wireless-Extender-DAP-1320/dp/B00DEF48I8/ref=sr_1_3?ie=UTF8&qid=1491055879&sr=8-3&keywords=D-Link+DAP-1520
http://amazon.co.uk/NETGEAR-Extender-External-Antennas-EX3700-100UKS/dp/B00XYEPLXU/ref=sr_1_2?ie=UTF8&qid=1491055879&sr=8-2&keywords=D-Link+DAP-1520
http://amazon.co.uk/D-Link-Wireless-AC750-Range-Extender/dp/B00PVCXB4Y/ref=sr_1_1?ie=UTF8&qid=1491055879&sr=8-1&keywords=D-Link+DAP-1520
if so, do you have to connect to that if you move rooms or do you still connect to your base router? any other suggestions?