My personal recommendation would be to use a modern mesh system, as said above size of house etc played a huge part and placement etc.
We have a 3 bedroom medium size house, we are on 500mb virgin media broadband and currently using the 2 x Eero Pro.
Take a look on amazon quickly on the Eero systems as they are on sale at the moment, 2 will suit a small house, 2 x Pro will work for a medium home and 3 of the smaller ones or if you have 350-500mb I would go for the Eero pro.
My wifi has been SOLID since the Eero system, speeds not as good as my TP-Link M9, but the M9 had issues of wifi cutting off, sonos playing up, devices not connecting to wifi.
Eero I have just tested and this is what im getting with 2 x Eero pro on wifi (and i also use an 8 way Netgear gigabit switch behind TV for devices hard wired)
Eero Pro Wifi Speeds, average speed on a test from iPad Pro and iPhone
Living room: 420mb
Bedroom with Eero in: 295mb
Bedroom next door to Eero: 195mb
Garden: 75mb
Not had a single glitch since having my Eero.