Current Apple laptops are pretty much all SSD. Checking the lineup, it looks like only the bottom end MacBook Pro still has a hard drive (500gb, 5400 rpm). The other MacBook Pros and the two MacBook Air models all have flash storage.
Once you have adequate RAM on a machine, the best way to boost its subjective performance is to substitute an SSD for a hard drive. Next time you visit an Apple Store, bring a stopwatch and time the various models rebooting.
My primary concern is reliability of SSDs versus a hard drive. Notice that they recommend true SSDs for reliability versus a thumb drive.
In a related story....
Most media will only last a few years. 10 years if you are lucky. That means all of those baby pictures or wedding pictures will be gone in a few years if a person isn't vigilant. So much for our modern world. DARN IT!