16 - 32 ohm moving coil speakers

Hi everyone .
There are large 15" and 18" speakers on the market. among these it is possible to choose the moving coil which can be 4-8-16-32 ohm.
According to your experience, can you tell me what are the differences between a 4-8 ohm speaker compared to those with a 16-32 ohm moving coil? . Is it true that the 16-32 ones are characterized by a smaller distortion? I imagine you need a suitable amplifier for driving.
 
I see 10", 32 ohm bass guitar drivers that can be used four at a time, connected in parallel, to get an 8 ohm load suitable for a 4 x 10 cabinet.

However, I'm drawing a blank on the 15" and 18" versions you mention. Can you link to examples?
 
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