Should i buy an iPhone or an iPad?

[Sam235]

Hello ,
I am debating weather to buy an iPad or an iPhone, I'm not sure which one really fits my needs, and I really want to only buy one, its for financial reasons i just really want to spread my work and only depend on 2 main devices, Laptop/iPad or Laptop/iPhone and i don't want to get an Android phablet because I'm too invested in the Apple ecosystem and i already have a lot of apps purchased because the whole family use apple products, if i go with the iPad i will be using a cheaper phone just for calls and texts like the HTC Wildfire S


What I am going to use it for:
-Email
-Reading Books
-Notes
-Calendar
-Music
-Internet
-Apps
-iWork
-Viewing pictures
-Youtube

What i Want:
-Portability
-Big Screen
-iCloud integration (no android or windows tablets)
-Long battery life
-good display
Thanks alot and sorry for my bad english