Other considerations before buying an Ipad or PC Tablet are:-
Memory, can you upgrade your iPad or Tablet? Has it enough memory?.Does it have a SD slot?
Software, can that be upgraded? What version is the device running?
Processor Speed, what is the speed of your iPad or Tablet .
Ports (Sockets),What Data/Input and Outputs does your iPad or Tablet have? HDMI? USB?
Adobe Flash Player, Check if you have a capable iPad device. as a lot of internet Video content uses this format,
Camera, does it have one (forward facing) and a second (rear facing) or none? , how many Mega Pixels?
Mic, does it have a microphone or Mic input jack socket?
Speakers, Does it have them and/or Headphone Jack Socket
Operating System, is it an "Android", "Windows"," Apple" or other operating system?
Android v Ipad Blog