I was going to buy the Samsung Galaxy Tab 2.70 because of the rear camera & Extra storage through Mini SD
But i hear the Nexus 7 is a better & faster tablet.
What can you tell me to convince me to buy the Nexus 7
The Nexus 7 is a faster tablet. It's got a quad-core processor. It's got a much higher-resolution screen. It's got more built-in memory. It runs the latest Jelly Bean so you get the native swiping keyboard, the multi-user support, lockscreen widgets, and the full-on vanilla Android experience like Google intended. The loss of a 3 megapixel rear-facing camera seems like not much of a loss to me, personally. And you can get a 32GB version that will have plenty of memory for most on-the-go users, and get an OTG cable to attach a USB thumbdrive if you really must have more.
But if a rear-facing camera and Mini-SD slot are dealmakers for you, the Galaxy Tab is a solid fondleslab at a reasonable price.