This is a very important question. Because mechanical tension (force) causes muscle growth, and you're limited by your power output (force times velocity), you want to maximize force by minimizing velocity. However! If you are voluntarily slowing your reps, you will not be creating the intensity required to recruit all of your muscle fibers. Only when slowing is involuntary (near failure) is stimulus maximized. Also, going down should be controlled to prevent injury and standardize form

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They work hand in hand, neither is necessarily better, but time under tension is a direct factor for hypertrophy among other things. Oxidative lifts are a great way to build a shit ton of mass and make your tissues more mitochondrially dense and extract more oxygen. Good to swap between tempo and non tempo work after several weeks of each. Go eccentric-> speed work and repeat the cycle

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I would imagine taking your time to feel the target muscle(s) activating with each rep would build more muscle (and also improves form and that mind-muscle connection), but I’m no expert

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