I would choose the Note because of the screen size and the abilities of the stylus. The phones are similar in specs. GS2 has a 1.2mhz dual core and Note has 1.4 mhz dual core.
Here are spec comparisons Samsung Galaxy Note versus Samsung Galaxy S II: spec comparison
For me, I would like to carry 1 device to check email and games. I have a Xoom and a Skyrocket. I use both during the day. But i find myself using the Skyrocket more and more. With the slightly larger screen size of the Note, I could cancel my Verizon service and use the Note all the time.