i want buy a laptop for mac app developing.and i will use this for long time. maybe for whole day.which one is the batter for this.hp envy notebook 17 n-108tx or dell inspiron 7559 i7.one thing more i also ask by the way of cooling system.which one is the best and i can use for long time without doing hot or hang.please arrengty answer me on my email [don't post your email address on the forum]