Panniers - Racks - Bags - Bike Luggage

Boop.

SO! I'm torn between the Millican Smith and the Brooks Pickwick (small):

http://www.homeofmillican.com/smith-the-roll-pack-18l.html
http://www.brooksengland.com/catalogue-and-shop/bags/cycle+bags+%26+accoutrements/PICKWICK+Small+Backpack/

Bearing in mind here in the Finlands the smith will cost me just under €150 euros including delivery and I can get the Pickwick for €200, so there's not as much in price as the websites might suggest.

Considerations:

• Brooks is 50% more expensive
  
• Brooks looks a bit snazzier
  
• Millican is a bit bigger
  
• Millican has a few more fancy pockets
  
• Millican won't make me seem as poncy as having an expensive Brooks branded bag.
  
• Millican has modern padding around the straps, Brooks does not.
  
• I can get the Brooks NOW (it's in shop here)
  
  

Things I could do with answers to:

1. Is one going to be more waterproof than the other?
   
2. Can either be mounted to a rack should I want to do that?
   
3. Has anyone carried a laptop around in the Brooks and can comment on my thoughts that it'll get uncomfortable compared to the padding on the MIllican?
   
   

Any other thoughts appreciated! Time to push the button.