These two modes are very similar and do basically the same.

Their usefulness heavily depends on the configured provider back-ends (so called "omni-completion" )... and from what I see both don't bring notable Perl support out of the box.

At least plsense builds on auto-complete to provide Perl omni-completion.

But if you have details on why to prefer the one over the other, I'd be interested to hear them.

> I prefer flycheck to flymake,

IMHO fly-make is build in, that's why I use it. The intention of my talk is to give an overview, people are free to experiment and contribute better solutions.