One benefit of vaping at higher voltages (with correspondingly higher Ohms) is battery life, both between charges and overall. Here are a couple of examples using
Ohm's Law:
A 1.2Ω coil at 10Watts will require about 3.5V and consume about 2.88 Amps
A 2Ω coil at 10Watts will require about 4.5V and consume about 2.24 Amps
A 2.5Ω coil at 10Watts will require about 5V but only consume about 2 Amps
As you can see, for a given Wattage, the higher Ohm coils consume fewer Amps, and since Amps are what your battery runs on, the higher the Ohms, the lower the Amps, the less stress on the battery, and thus, longer battery life.