推荐回答（2个）
ipad目前有三种尺寸的屏幕，分别为7.9英寸、9.7英寸和12.9英寸。
iPad各型号介绍：
1. iPad Pro
价格范围：约5888-7888元
作为最新的旗舰产品，iPad Pro拥有系列最大的屏幕，达到了12.9英寸，几乎就是一款没有键盘的13英寸笔记本。当然，它也与此前的iPad有些不一样，比如支持Apple Pencil手写笔、非蓝牙连接的键盘盖;再加上软件方面针对多任务、分屏操作的优化，使其使用形式更为丰富。通过众多媒体的评测可以看到，iPad Pro并非是一款最理想的生产力工具，但可以成为半生产力、半创意设计的设备，完全替代Windows笔记本是不现实的。另外，还需要考虑到预算，728元的Apple Pencil、1288元的键盘盖，再加上机身价格，已经可以购买一款配置不错的超极本了。
适用人群：艺术家、创意工作者、喜欢大屏幕iPad的用户
2. iPad Air 2
价格范围：3588-5888元
Pad Air 2是传统9.7英寸的最新机型，同样拥有黑、白、金三种颜色可选，虽然处理器、屏幕分辨率略逊色于iPad Pro，但其最高配机型(4G+Wlan、128GB)的价格才仅仅为iPad Pro的低配机型，显然更适合一般用户。另外，iPad Air 2在软件特性上也继承了一些高端特性，支持分屏应用，只是无法兼容Apple Pencil和特制的键盘盖。
适用人群：追求较好性能、体积平衡的一般用户
3. iPad mini 4
价格范围：2888-5188元
iPad mini 4作为迷你系列的新款机型，内置A8处理器、2GB RAM，新增了Touch ID指纹识别 传感器 ，同时也支持iOS 9的多任务分屏特性，基本上可以看作是缩小版的iPad Air 2。当然，它的 门槛 也更低，价格方面具有一定优势。一个问题是：购买了iPhone 6 Plus或iPhone 6s Plus的用户可能不再需要一款8英寸平板，所以对于大屏手机用户来说，更大的平板可能是更好的选择。
适用人群：追求价高性能、便携式应用的平板用户
4. iPad Air、iPad mini 2
价格范围：2888-4188元(iPad Air)、1988-3288元(iPad mini 2)
两款老款机型iPad Air和Pad mini 2依然在售，苹果显然是希望通过它们来填补低端产品线。性能方面，它们都无法与先进机型相比，容量也仅有16GB和32GB、仅有黑白两色款式。当然，它们的价格已经变得较为低廉，即便是4G+Wlan机型也不算十分昂贵。这两款机型已经不能支持iOS 9的分屏应用特性，但对于只想使用平板上上网、玩玩游戏和看视频的朋友来说，低配款式无疑是最好的选择。至于尺寸，只需根据自己需求选择即可。
参考资料
平板电脑.太平洋电脑网[引用时间2017-12-25]
iPad Mini是一款经过全新设计的平板产品，配备了7.9英寸LED背光显示屏，达到1024x768 分辨率，而每英寸显示像素达163ppi。
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