^Agreed
3G sensor and a Keydiver chip is the cheapest and quickest to switch to.
A MAP and IAT sensor set-up has the advantage of speed density. As far as I know the only way to do this is with ECMLink or MAFT Pro or full standalone. All cost much more the the 3G sensor and chip. Speed density is great if your doing serious tuning but isn't that great on a car with simple bolt-ons.
As far as what's best for your car, it really depends on what your set-up is and what your power/performance goals are.