Porter-Cable tools were good, ~50 years ago.
Now? Not so much. IMNSHO. With some possible exceptions.
Next, those hook end blades are JIGSAW blades.
Jigsaw and scroll saw are different tools.
The predominant Jigsaw blades nowadays are T-shank blades. Some old jigsaws used U-shank blades.
Scroll saw blades come in plain-end and pin-end configurations, to match the appropriate blade clamps on the scroll saw.
A Jigsaw is a handheld power tool, a scroll saw is a bench mounted power tool.
Some old-timers called a Jigsaw a scroll saw, but that's not the current terminology (for maybe ~50 years or so).
Jigsaws come in two main configurations, top handle and barrel configurations.
Go to the Bosch or Dewalt websites and look up pictures and options for Jigsaws and scroll saws (among other sites as well, heck you can go to Harbor Freight and look them up too).
The Dewalt 20" scroll saw used to be a top rated option, don't know if that is still true or not.
Bosch Jigsaws used to be top rated, and are still at or near the top AFAIK.
Just what tool are you considering?