Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Canon ELPH 150 IS and Samsung NX2000 side-by-side from the front, back and top in their relative dimensions. Canon ELPH 150 IS has external dimensions of 95 x 57 x 24 mm (3.74 x 2.24 x 0.94″) and weighs 142 g (0.31 lb / 5.01 oz) (including batteries). Samsung NX2000 has external dimensions of 119 x 65 x 36 mm (4.69 x 2.56 x 1.42″) and weighs 228 g (0.50 lb / 8.04 oz) (including batteries).
Below you can see the front view size comparison of Canon ELPH 150 IS and Samsung NX2000. Canon ELPH 150 IS is clearly the smaller of the two cameras. Its body is 24mm narrower, 8mm shorter and 12mm thinner than Samsung NX2000. As you can tell, actually this is not a fair size comparison since Canon ELPH 150 IS has a built-in lens but Samsung NX2000 doesn't. Once you put a lens on NX2000, its thickness will increase significantly.
Now lets look at the top view comparison of Canon ELPH 150 IS and Samsung NX2000.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon ELPH 150 IS is significantly lighter (86g ) than the Samsung NX2000 which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on NX2000, the total kit will weigh much higher.
Unfortunately neither Canon PowerShot ELPH 150 IS (IXUS 155) nor Samsung NX2000 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing Top Mirrorless Cameras with Weather Sealing
LCD Screen Size and Features
Samsung NX2000's 3.70" LCD screen is slightly larger than Canon ELPH 150 IS's 2.7" screen.
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.