1. You cannot get what Apple offers from anyone else. Quality of device + Flash storage options + Price. No one comes close. In the low end 16 & 32, possibly, but 64, 128, 256, 512, & 768 there is no comparison.
2. SD Cards have no business in an iOS device. Go get an AirStash and use it, if you need a more tangible idea of what the SD card experience would be like. Non integrated, Apps would never "Save To" the SD, they'd be Read-Only. So your loading content onto the SD card (Presumably from a computer which most iPad owners won't even have!), and then popping it in to your iPad, to access that content from some Safari or another generic file browser, and viewing your files or music or movies, outside of the dedicated apps that are intended for this.
The best way to describe an SD card on the iPad would be if the Finder in list view + Quick Look were the extent of your usability.
3. Regarding Android, I think what you mean to say is that there are a lot of People who buy idevices because they're cool. The people who actually buy android devices have no idea what they are doing. I make every android user I meet explain to me why they have an android device and not one of them can come up with a reason that makes any sense. They also don't use the devices for anything but the most basic, general phone/tablet tasks.