Analog Hall Effect Sensors
I like the +/- 18mT. The +/-9mT has a steep response curve but is not really that much more sensitive at a longer range. It also plateaus in a wide range (see graph above). The +/-73mT is fine and likely the better choice if working in a very short range. See video below.
The DRV5053 device is a chopper-stabilized Hall IC
that offers a magnetic sensing solution with superior
sensitivity stability over temperature and integrated
The 0- to 2-V analog output responds linearly to the
applied magnetic flux density, and distinguishes the
polarity of magnetic field direction. A wide operating
voltage range from 2.5 to 38 V with reverse polarity
protection up to –22 V makes the device suitable for
a wide range of industrial and consumer applications.
Internal protection functions are provided for reverse
supply conditions, load dump, and output short circuit
or over current.
Full datasheet From Texas Instruments can be found here: drv5053.pdf