Guys, just wanna ask your opinion.

I've been using unifi with a TP-Link TL-WR841ND and a wireless repeater Aztech WL559e.

My room upstairs is basically the furthest place from the router which is located at the living room next to the tv. Even with this setup is not super ideal but I'm still getting acceptable speeds. Without the repeater it's almost impossible to stay connected.

I put the repeater upstairs outside my room and it's only getting one bar. On the manual is recommended to put it at a place that at least 2 bar but no matter where I put it upstairs it's still one bar.

I've tried switching channel and all but theres no difference. Home plug doesn't work because my house is 3 phase wiring.

Recently I've been looking at the asus RT-N14UHP. I wanna ask is there a difference compared to the tp link router? On paper it seems better but in real life application does it really has a high wireless coverage?