Unless specific projects require functionality beyond the powers of generic professional CAD programs (or prospective add-ons), you ought to be made most happy with whatever wares are most approved by professionals and most readily mastered by the neophyte. At or near the top of that list would be SolidWorks.

Many of us will have reservations about even the most popular and deservedly respected wares. But your search will be forced to settle for the software-engineering faults or impediments which CAD wares in general may yet to have truly conquered. To satisfy your yet-uneducated intention to make the best decision, you might be encouraged to find engineers and forums where projects similar to whatever you intend to engage in are routinely and expeditiously finished to the highest standards. I think you'll find the same suggestion at the top of that list.

Once you make your choice, you must conquer the resultant learning curve. Note how many online solutions exist for the problems you intend to solve. The populace of the user base and the ready availability of tutorials and solutions should be a principal deciding factor. You will notice the same suggested product at the top of that list.

You can't hurt yourself by giving a free product such as FreeCAD a spin. FreeCAD works much like SolidWorks. Yet my experience is that FreeCAD and its likes will fail your purposes, long before your initiation develops its first real inertia.