I currently have 9 Decos spread across the house and garage with a mix of M4r, E4r and S4, as I live in a house built in 1815 the walls are super thick and very long with various extentsions etc.

I was looking to upgrade to maybe a newer set and with 1gb fibre coming next year where i am on 4g currently whats the best solution, I was thinking of a 3 pack however will these newer units give me better coverage? 

I know wi-fi 6 will help me a lot but that's not the main consideration but just better coverage with fewer devices, or am I better off sticking with what i have or even in the few locations where speed is not an issue like the garage keep back a S4 for that?

I was looking at the X50/X60/X1500, I dont mind spending on these they will give me a wider coverage.