Hamas have often used the Qassam rocket. It’s essentially a pipe bomb with nozzles: grossly inaccurate and not good for much except scaring people. You could burn a house or two down if you did it while people were away at work.
Hezbollah are too far away to hit anything of strategic value with a Qassam, which is why they use Fajr (or Katyusha) rockets. They’re still unguided, but their range is much longer. They are significantly larger than a Qassam and are manufactured (not cobbled together). They require a little bit more infrastructure to operate, and are military hardware that you’d find in a real army. Neither the Qassam nor the Katyushas should be described as “long range” - both fall well short of the 1,000km rule of thumb that defines a short range ballistic missile (SRBM). While arbitrary, the 1,000km boundary is standard throughout the US Department of Defense and is also used by many of our allies.
For comparison, a Fajr-3 is about half the length and a quarter the diameter of a Scud-B, which is itself considered a very small missile. Some ICBMs are more than three times the size of a Scud in each dimension.