I was faced with the same issue about a month back, did some online research, and went with the Galaxy Tab 10.1. I think it was an awesome decision, and don't regret it to this day.
Compared to the iPad2, the Galaxy Tab 10.1 is slightly thinner, quite a bit lighter, has a slightly bigger screen, has a higher screen resolution and a higher pixel density (pixels per inch, higher = sharper crisper images, which is definitely noticeable; the iPad2 looks a bit crappy when sitting next to the Galaxy Tab 10.1), has more RAM (double), has higher resolution front and back cameras, supports HSPA+ 21mbps, and is more aesthetically pleasing on the exterior. It also runs Android Honeycomb 3.0 and will be upgraded to Ice Cream Sandwich 4.0 in the near future, which is the best Android version released to date.
I'm very happy with Android - there is full support in South Africa for the Android Market, unlike the iTunes App Store which is pathetic (in ZA) and you have to jump through hoops to get a US iTunes account. I buy all my apps using my local South African credit card as and when I need, and I get to see the price in South African rands, and I don't need to buy prepaid iTunes vouchers from 3rd party suppliers.
Also, there are far fewer restrictions with Android. With iPad2, you can't download apps or other content bigger then 20mb if you are on a 3G connection, which is an insane restriction if you ask me. You have to download these over a WiFi connection. You also aren't able to access Adobe Flash content.
Lastly, I believe the iPad2 comes with a 1 year warranty, whereas the Galaxy Tab comes with a 2 year warranty. I'm not 100% sure, but I know that if you get the Galaxy Tab from Vodacom/MTN/Cell C, you definitely get the 2 year warranty. I don't think the cellular operators are selling the iPad2, so you can't benefit from the extended warranty.
If you don't care about all of the above, then the iPad 2 is a really good device, and I would recommend it. Decide for yourself - check out the specs and reviews on GSMArena.com.
Here is a quick comparison of specs between the 2 devices:
http://www.gsmarena.com/compare.php3?idPhone1=3848&idPhone2=3892