Help Needed Just recieved replacement tablet what should i do ?

Hi Guys thanks for the help on this forum just asking for some help regards to what you guys would do in my situation
i recieved the replacement tablet yesterday still in its box my other tablet which is working fine so i am going to give it to my son i dont think throwing it out is a good idea what a waste .... ill keep new one
the older tablet is still stock and i havent touched the new one yet
whats your thoughts ? which one should i change etc ?

thanks heaps

:):D:D:D:D:D