Now that I have an nvme SSD in all my computers and boot times are roughly 10-15 seconds or so unless something has gone wrong, the advantage of sleeping is somewhat mitigated.

Back in the spinning rust era, though, a good unsuspend could be something like 50 times faster to get to a running computer. Possibly more, depending on what your OS needed to start up.

It is still more convenient to have my previous environment most of the time, and still faster to unsuspend than boot, but it isn't as much of an advantage as it used to be, no.