Depends on how you are going to use the car.
Just keep 2 things in mind :
If you want it for off-road purpose & if you have a big family of 5-6 ppl then definitely buy the V6 for powerful engine and will have less load on the engine.
The heavier car gets, load falls on the engine.

If you have a small family & no plans of driving off-road... then i feel V4 would me more economical.

Choice is yours :)