I dont know what to recommend...
Sta. Fe - Diesel nga... But if you are planning to own it for 5 years or more... Nakow po... Ang mahal naman ng parts ng CRDi compared to regular diesels where you can service it on your own. Yung Outlander 2.4L naman, gas which gives you lesser maintenance costs, pero kahit more than 10 years na ang Mitsubishi sa CVT, parang i-doubt it pa rin... The CVT costs a lot when its broken.
Sta Fe - Mahal parts if nasira... Injectors nya etc.
Outlander - Mahal ang CVT if nasira...
If gas I would go for the 3.0L MIVEC V6 Outlander

But kung diesel, the Sta Fe for sure, HARI is giving a 5 year warranty for the car. But... If Mitsubishi gives me the opportunity to pay a little bit more for a 5 year warranty... Hmmm... the 2.4L Outlander nalang kasi marami pa rin itong freebies... :hihihi: Sa Aussie, they get 6L/100 kms in the highway. 9L/100km naman sa City. Hope that applies here.
I hope this would give you an insight of the car you wish to get. Di naman siguro magagalit si sir Lui sa akin kasi he is in both brands. :hysterical: