If you are a "techie" at heart and enjoy customizing, get the tab. The things you can do with the Android OS are pretty much limitless. That's not to say that Android is hard to use, it is not at all, But it's not quite as intuative (sp) as an apple. Bascially if you pick up any apple product, you will know how to use any other apple product. Android has many different UI's which each manufacturer customizes to make their own. Which is why every android product looks different, and the fact that the end user can customize it.
Apple is very user friendly, anyone can pick it up and use it, and it's very hard to "wreck" anything on Apple products because they are so "locked down".
I do not have a tablet yet, but will purchase when the right one comes along. Right now there is no High end tablet that has an SD slot (w/o peripherials), this reason alone is why I am waiting.
Flash is going by the wayside, so in the future it will not be that big of deal. BUT, right now It's used on the majority of websites. It's up to you whether it's a big deal.
You can't go wrong with either one, as you can see by the posts & reviews, there's advantages & disadvantages to both.
If all the places you expect to use the tablet will have WiFi, or you will be in range of your own MiFi, then you don't need to look at 3G-4G tablets and additional data plans with associated added costs.
If you plan to use applications that depend on location services built into the tablet, and data streaming anywhere, then you may need built in broadband connectivity. GPS navigation is one example, when it uses assisted GPS and streaming of local maps and POIs.
Depending on size, screen quality, storage space, features and user interface (only a few tablets are multitouch) a tablet with WiFi only can be $250 to $600. A tablet with a built-in broadband connection starts within the upper end of that price range, goes upwards of $800. Some of that price may be absorbed into the first two or three years of your data services contract.
So think real hard about how you would use it. FWIW, I got an iPod Touch with the idea I would mostly use it where I either had WiFi or didn't need the connectivity. It is a great little pocket computer, but there are many times when I regret not going for the iPhone and full time connectivity, because I've found so many more apps I would use if I had the connectivity. Other people have different needs and different experiences.
You will have to sort out the size issue also. If you want 7-inch, that rules out the iPad, but gets you into a market where you have to choose between reader-like tablets for $250-300 ($200 when Kindle Fire becomes available) and full-function Android tablets for $500 on up.
We have had an IPad 2 for about 2 weeks. I am a geek but I was getting tired of my Android phone needing to be rebooted so we are giving Apple a chance. So far it is very nice. We have the WiFi only version. I have read that I can tether that to my cell phone for Internet access but I have not tried it yet.
Pros: Bullet proof apps, easy interface, large selection of apps, great screen
Cons: Expensive, poor cameras, WiFi only does not include a GPS receiver.