I don't knooooooowwwwwww!

My loving husband told me that he was going to by me an ereader. Yay, me!

I don't know which one to get. Boo, me.

I have looked into both the Kindle and the Nook.

They both:
Have the same screen size.
Can take SD cards for more memory.
Can play games.
Can play mp3 files.
Can browse web (limited).

Plus -

The Kindle:
Is lighter in weight.
Is $10 cheaper.
Has an e ink pearl screen.

The Nook:
Can share books. (MIL and SIL have Nooks. I could share books with them.)
Can read epub format.

I have the Kindle App on my iTouch and really like it. I tried the Nook App and ended up deleting it.

Any suggestions? I'm kinda leaning toward the Kindle, but I just don't know.