If you plan on getting a 55", I would suggest you also demo the TCL 55 P8S (around ₱28k cash at Anson's).
The biggest advantage that the P8S has over the A8US/P8US is
Wide Color Gamut (aka WCG), but basically everything else is the same. WCG can potentially bring better colors than a standard TV panel. Now, is this worth the extra ₱4-₱5k increase in price for the 55"? I would leave that to the potential buyer to decide.
Micro dimming / local dimming is implemented differently per panel type and per brand. The A8US uses a dynamic backlight system to do it, also known as "frame dimming" in other brands (i.e. Sony).
+ + +
Considering your budget, though, I would recommend getting the 65 A8US. It may not have WCG, but it is a bigger panel. Extra cost here might well be delivery to your house as a 65" tv will not fit in a sedan or crossover. Possible extra cost as well will be to get a guy to mount it on your wall, where it deserves to be.
Happy hunting!