That's a bit like going to an Apple forum and asking if the iPad Mini is to be recommended over the Mi Pad
If you have the iPad then do you need to change? It depends on what you want to use it for?
The screen size and resolution are the same as the retina screen on the new iPad Mini so viewing content in browsers, videos, books, newspapers etc will be similar (any changes will be down to colour/brightness)
BUT
The processor on the Mi Pad is a beast! It's a 2.2GHz Quad Core (+1) Tegra K1 so if you like gaming with lot's of fancy graphical effects (check out Trine 2) then this is for you.
The cameras on the Mi Pad are better but the software is limited at the moment. There are plenty of camera apps on the market for now though.
Expandable storage!!! You can buy a 16GB or 64GB Mi Pad and stick an up to 128GB microsd card in there! I have a 64GB mi Pad with a 64GB microsd card and have filled around 80GB with apps, games, music and videos so far
Android customisation! I am currently using Next Launcher 3D as MIUI for tablets is still very new and missing a lot of features but I have to admit I am more into the 3D and the Tegra K1 runs this brilliantly.
Not sure if I have helped. It's all down to personal preference really and how much you like Android. At least with the MIUI being similar in looks to IOS it's not as big a change for Apple users.