Answers: The ONLY difference in the two is the electrics method used to get the correct nouns to the amp.
How you load an amp determines the amount of power out.
There is a trade past its sell-by date though, the lower the impedance (ohms) the more power is pushed as well as difficult distortion and more heat is generate. The excessive heat will shorten the energy of the amp.
For best overall performance, it's far better to acquire a higher powered amp and nouns it with 4 ohms than a lower powered amp and force it to push more power near a lower impedance (2 or less ohms) nouns.
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4 is more common neither is an indication of man better. The ohm is just a part of measure which will requirement to match the output of the amplifier that you own.
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