Two is almost always better than one. With two smaller strobes, like the INON S-2000, you will not be limited as to how much of the image you can light, especially in getting those wide angle shots.
High-end strobes like the INON Z-330 or Sea&Sea YS-D2J feature a more powerful output, however, you may not be able to cover the maximum possible area. Especially when using wide angle lenses.
Two strobes are also useful in making sure light reaches the subject. Often when shooting macro, you don’t notice that your strobe is blocked by the coral and you may find it hard to position it so light actually reaches the subject. With two strobes there’s a higher chance some light will get into those cracks.
In addition, if you run out of batteries on one strobe for some reason, you still have a 2nd one!
That being said, one strobe is indeed enough for many types of shots. It can also produce nice dramatic lighting that is sometimes preferable over the even lighting of dual strobes. Especially with subjects that are full of texture, like lettuce coral and scorpion fish.
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