I'll throw in my 2 cents with 40 years of training natural. When you have a few years of training in it's important to try to get stronger. Muscles get bigger though for a lack of a better term muscular endurance training. If getting stronger was the magic bullet we would all warm up and train for sets of under 3 reps.
I think a the majority of your training should be volume training with 6 to 12 reps. Most sets are not to failure except on your last set. So you might pick 3 to 4 exercises per body part and do 4 to 6 sets. Short rest between sets. Your last set you should fail at your rep goal. Set one should feel moderate exertion. This is muscular endurance training.
Part of your training year should be devoted to low volume doing 3 sets and even 1 work set per exercise not counting warm up sets. The two polar opposite styles of training will work on increasing strength at one period of a training cycle and the other will increase muscular endurance. To many people use use one style or the other. I say use both.