Short version: iPad 2.
Long version: It all depends. The reviews for the Motorola XOOM are good, however, there aren't many honeycomb specific apps as of yet. With such a small app market, you may not get that great of an experience. However, I'm sure that more apps will become available soon. Personally speaking, and I really do like android on phones, I think honey comb is ugly. I really don't think google spent enough time on it. That being said, I am sort of biased. Honestly though, if you are willing to be patient, the XOOM may be a good choice since you already like android.
However, if you need great apps as soon as you buy the device, I would go for the iPad 2. I loved my first iPad. It's a very stable platform, and it just works. No tweaking, no need to reboot. The only thing I have to do for an iOS device is charge it. I highly recommend the iPad 2. You just can't beat the experience you get with an Apple device. They almost never break down, and if they do, you can always take it to an Apple Store and have the situation taken care of that day.
Hopefully I helped you.