"Advantages of 64 bit computer
The main advantage of using 64-bit version of Windows is that it offers better memory accessibility and management.
Enhanced security features like Kernel Patch Protection, support for hardware-backed data execution protection, mandatory driver signing, removal of support for 32-bit drivers and removal of the 16-bit subsystem available.
Performance of those programs that are specially written for 64 bit operating system is great.
Disadvantages of 64 bit computer
There is no specific disadvantage of using this version but there are some things you have to take care of before deciding to use it.
You should check availability of device drivers because 32 bit device drivers do not work on 64 bit version.
Most of the hardware devices are not compatible with 64-bit computer.
Device drivers must be digitally signed by the developer.
Some programs of 32 bit aren’t compatible with 64 bit."