Good conversation.
Like all that have chimed in on this subject (thank you) it seems to me that there are many ways to skin a cat. The bottom line is finding out what works best for you. Try them all, keep detailed accurate records, evaluate and go from there.
Personally I prefer, have gotten my best results with a very (relative term) fast paced workout. I hate waiting and will usually do an opposing muscle group between sets of curls for example, plus this ‘style’ has been shown to improve the recovery time of the muscle being worked. Interesting. Failing that, on straight sets, 20 - 30 seconds works best for as I am only interested in strength gains as a function of progression, not bragging rights
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Skip the science and up the desire I always say.