We will be in both Oslo and Stockholm and have the choices of visiting either the Nobel Peace center in Oslo or the Nobel Museum in Stockholm. Any preferences, opinions, or suggestions will be appreciated. Thank you.
I'm not sure why it's an either/or proposition, but anyway...
I've been the the Nobel Museum in Stockholm. I'm heading to Oslo for the first time next month, so I will probably visit the Peace Center there, but I can't comment on it yet.
As for the museum in Stockholm, I thought it was a fine museum, and worth an hour or so. It's in a very convenient location where you're likely to pass right by it while visiting the Gamla Stan (old town), so if the mood strikes and the timing works, step inside and check it out.
Stockholm has many other things to see that are, in my opinion, more worthwhile, so if you're pressed for time, I'd say it is not a must-see.
Rick Steves gives both attractions 1 triangle (out of 3), which he defines as "worthwhile if you can make it."