I own a Galaxy Tab 10.1 , and something that makes ALL the difference is its support for USB , Micro SD's , as well as HDMI. Resolution is also better than the Ipad 2. I personally LOVE this tablet , and never experienced any lag with the powerful processor and really nice graphics. CHECK OUT RIPTIDE GP!
http://www.gottabemobile.com/2011/08/03/samsung-galaxy-tab-adapters/
Also , ICS will be comming to Galaxy 10.1 via Over the air update which is open source and is expected to attract a shed load of devs..
You can also overclock up to 1.6 GHz, as well as install a full Ubuntu. Not only Ubuntu but a Multitude of Roms which can increase battery life or add new features.
http://galaxytabhacks.com/galaxy-tab-10-1-hacks/how-to-install-ubuntu-linux-on-galaxy-tab-10-1-tabuntu/
http://forum.xda-developers.com/showthread.php?p=3958776
Also Androids app market is eh fastest growing in the world and with ICS , i assure you there will be a ton more Tablet apps.
