Or you could let the non-dominant arm/side be the deciding factor when the set is over.
You probably won't notice this with chest presses. Most people are concerned with this when it comes to arm exercises. Especially biceps. If I curl 50 lbs. 8 times on my left arm and only 4 times on my right, what should I do? Do 4 reps and quit.
The idea of using a different weight has been suggested, but in order for a body part to grow it must be overloaded. I'd let the non-dominate side dictate the weight. Or have a spotter help you out. I usually start the set off with my right (being I'm left handed) so that I know when I've reached failure.
If you were to use unequally weighted dumbbells, then your stronger side would need a heavier weight so that you reach failure evenly. But that idea, while sounding good in theory, only serves to keep the gap growing. Why not let the weaker side catch up? I'd use the same weight. But I would let my weaker side dictate. Do you really want your stronger side growing faster? Probably not.
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The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.