Cost
The Mazda B4000 will tax your gas budget considerably more than the B2300 will.
When it comes to MSRP, the Mazda B2300 costs substantially less than the Mazda B4000.
The Mazda B2300 will save you a lots_of_money at the pump every year compared to the Mazda B4000.
The Mazda B4000 will cost you a lots_of_money in gasoline every year compared to the B2300.
Utility
The Mazda B4000 will most definitely prove friendlier than the Mazda B2300 for those of you with frequent child-cargo.
There's no clear winner between the Mazda B4000 and the Mazda B2300 in terms of transporting cargo.
The Mazda B4000 outpulls the Mazda B2300 by a sizeable margin.
Convenience
You'll most certainly have to take the Mazda B4000 for a fill-up more often than the Mazda B2300 because of its tank size and gas mileage.
Dimensions
The Mazda B4000 is tremendously heavier than the Mazda B2300.
Your wallet will hurt more every time you fill up the B4000 than the Mazda B2300 because of its bigger tank.
The B2300 and the Mazda B4000 compete for the same parking spaces.
The Mazda B4000's longer wheelbase will likely result in a smoother, more stable ride; on the flip side, the Mazda B2300 may give a more maneuverable feel in daily traffic.
Performance
With respect to horsepower, the Mazda B4000 packs quite a wallop and will knock the Mazda B2300 down a few rungs. However, keep in mind that high horsepower engines often command higher insurance premiums.
Handling
With its tighter turning circle, the Mazda B2300 is quite certainly nimbler than the B4000, something to consider if you do a lot of city driving; however, keep in mind that a vehicle with a tight turning circle may feel a bit twitchy on the highway.
Drivetrain
The Mazda B4000 has a more sizeable engine than the B2300. Keep in mind that smaller engines typically get better gas mileage, but smaller engines can be stressed more.
Torque is roughly equivalent to acceleration, and in this respect, the Mazda B4000 is tremendously more powerful than the Mazda B2300.
Warranty
The B4000 and the Mazda B2300 have the same basic after-sale protection.