To answer the question, I'd probably go with the f/2 for 3 reasons
1. Smaller (one of the biggest reason I switch to Fuji from Canon is to have a compact more discreet, lighter)
2. Cheaper (I'm a hobby photographer and have to be somewhat reasonable when I buy gear )
3. Faster AF
But, if you told me I could only have one lens and only could chose between these 2 I'd go with the 1.4