Right: near failure is within one or two reps of outright failure, when your muscle gives out.
Working to failure all the time, no matter what muscle, can lead to overtraining and risk of injury. It also fatigues your muscles so that you stop progressing. Working to near failure avoids these risks.
It's better to periodize your overall plan so that you work mostly to near failure, then to failure every few weeks or so. I wouldn't do both in one workout.
Actually, you build muscle and strength better in working to near failure, than in working to failure.
Working to maximum reps means building endurance in that particular muscle. I usually have a goal for each workout and it's one or the other, not both.
Hope this helps...
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