N router vs AC router

[jyeh74]

I currently have a basic Linksys N router located in my master bedroom closet. I noticed some areas of the house will get no reception particularly the bedroom downstairs away from the router. Assuming a basic N router and a basic AC router will the range be around the same or will the AC router have greater range? I am not sure if I should just get a range extender for my N router or buy a new AC router. I have 50 megabytes per second download speed and do basic surfing the web. I found these two from Costco but did not indicate anything on range. I am not sure why there is a 40 dollar difference between the Netgear and the TP Link.

$160
http://www.costco.com/Netgear-Nighthawk-AC1750-Wireless-Dual-Band-Gigabit-Router.produ...100135269.html

$120
http://www.costco.com/TP-LINK-AC1750-Gigabit-Wireless-Dual-Band-Router.product.100146418.html

[redwudz]

The same. Your data throughput could be greater if your devices have a AC LAN adapter.

http://www.tomshardware.com/answers/id-1655916/band-devices-range-wireless-router.html

[p_l]

I greatly extended the range of my already pretty good Netgear WNDR3700v3 by adding an Amped SR10000 High-Power Wireless-N 600mW Smart Repeater, and I now get a good signal through brick and 3-foot fieldstone walls throughout the house and out onto the backyard terrace.

[jyeh74]

I have a crappy Linkysys n router.
Model E1200
http://www.linksys.com/en-apac/products/routers/E1200

How do I check to see if my smart tv and devices are compatible with ac router?
I couldnt find anything here

https://docs.sony.com/release/specs/KDL70R550A_mksp.pdf

https://docs.sony.com/release/SPECS/BDPS5100_mksp.pdf