I am going to try and keep this short.
First, the packaging for the gen 2 is exactly the same, though the dimensions of the USB and lightning connection are slightly different.
The magnets are indeed stronger in gen 2, but the lightning part sticks out more. The gen two connections are rounded and slightly bigger. The light on the gen 2 is green, instead of orange. The data transfer works fine.
Personally, I don't like the gen 2. For one, it doesn't work well with my case, but works fine with my wife's. Also, it is easy to loose connection even if it is slightly off.
We were sent two, and one doesn't work at all. In the photos below, everything on the left is gen one, and right is gen 2. Oh, and last, the LED is on both sides on gen one, but only one side on gen two.
Both will do just fine. I would say the biggest two factors, are what case you're using, and if you care to transfer data with this cable. I can transfer with my Apple cable and use my gen one most of the time, just to charge, so it never gets tugged.
Hope this helps.