Correct. "Longest" gets you far less drones, but because your bees spend less time being cycled in/out of hives they're spending more time producing... though in the short term the extra resources are negligible, as it's a very low percentage of an increase for any decent automated setup.
Bees may produce resources randomly whenever they tick, so if you had a bee that lived twice as long as another, one of the former's lifespans would produce exactly double that of the latter's on average (putting aside all other factors).
That said, there'll quickly come a time when you don't care about getting extra drones of a given species. At that point increasing lifespan doesn't hurt (because why not?), but there's certainly no point in prioritising it.
Another tip or two: When you get a new species of bee, it'll come with both positive and negative traits specific to that species. Pay attention to the bee databank to make sure you're not missing anything you want to isolate, as you might accidentally replace those traits with those of the parents before realising they were "up for grabs".
Identical drones stack, and stacked drones can be bee-alysed with a single drop of honey. This becomes useful once you start using the gene pool machine.
Imperial and industrious bees produce resources needed to make alveries, but they don't produce wax (which you'll also need loads of). Imperial bees are a great source of honey drops, though: they produce two types, both of which work in the beealyser.