I consider myself a computer geek.
Computer geeks tend to gravitate towards Android more so I'm naturally biased in favor of Android.
I have an Android phone and an iPad2 (started with iPad1).
Right now, the Android tablets are lagging far behind, so usage-wise, I would much rather use an iPad2. The apps are just way more for an iPad than for an Android right now.
What about the future?
It's anyone's guess but you can look at what happened with Android phones, which also started out late. Today, even though the iphone still has many more apps than Android phones, there is no real difference in practice because 95% of all the good apps that you would want are already available on android. I love my Android phone and consider it much better than an iPhone, as you have a lot more freedom with it and can do a lot more things. The iPhone however is probably more idiot-proof and easier to use overall though.
I expect the same thing will happen for tablets for Android, where one day I will hop onto Android tablets and never look back. But I don't know when that will be. It could be 2-3 years out.
Also, bear in mind that right now, many companies will develop apps for the iPad first. In fact, we (BrillKids) is one such example - we are working on an iPad app for Little Reader and have no plans to make an Android version anytime soon. It will only start becoming a priority once Android tablets really take off.
Since you're unlikely to keep using the same tablet for more than 2-3 years, my advice would be to get an iPad2 now. At least you'll be able to enjoy Little Reader!