OK, so "best" can mean different things to different folks.  I guess I'd mean "easy to learn", but perhaps the "most useful for modeling little parts" might also be a good definition in this case.

One of my kids likes to use the 3d printer for accessories for lego or cobi minifigures, etc.  He has gotten fairly good with TinkerCad, but I'm hoping to get him to learn the next step to learn a real skill.  

We did look at Fusion 360, looks fairly complex, but powerful.  Is there a better Go-To software to learn for modeling focused around 3d printing?  Sketchup Pro seems popular also.  

ETA: Right now we are just using a Ender 3 Pro, but looking at resin printers also.  Not sure if that makes a difference in what software is best.

Thanks for any input!

That's going to be the most popular product, for this application.
Plenty of Youtube vids and series for you to learn.

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F360 or SolidWorks.

I'd not even consider the others.

F360 is probably your best bet for something he'll be able to continue grow with and always be commercially valuable.

It depends on what "skill" you are wanting him to learn, and more specifically what file types he wants to modify and/or create.

Fusion360 and SolidWorks are great for designing/modeling for CAD applications.

Blender and Meshmixer are great for drawing/modeling for artistic applications.

Solidworks but I have a soft spot for Creo.

I don’t think it gets much better than free f360

If you want a professional cad program prepair for some sticker shock. Students/veterans get really good prices on Solidworks and then of course there's fusion 360. Any cad software will have a high learning curve to use it well.

For those of us with not so deep pockets, Alibre Atom for $149 works well.  On sale for $99 now.
https://www.alibre.com/buy-now/

Does not use the Parasolids modeling engine, uses ACIS. So while it can import Parasolids based files (i.e. created with Solidworks or other Parasolids based softwares), you cannot manipulate them.

But it works just like most any 3D modeler, you sketch on planes, extrude, cut, etc. Its parametric, can loft, sweep, pattern, etc. also creates assemblies and drawings.
its a download to PC, not cloud based, I like that.

$50/year keeps you current.
$300 gets you Atom plus Meschcam in case you have a CNC mill, that gets you the CAM portion for creating g-code files.

I used solidworks since 2,000, but when I retired I needed a home priced solution.
For industry knowledge and adoption, Solidworks is hard to beat, but its $$$

I avoid the "free" ones, inevitably they change later to a pay only deal, then you're stuck with time invested and models in their format.

Fusion360 can get pretty clunky sometimes.   And it tries to do too much all the time.

I've gotten better performance out of https://www.rhino3d.com/.  And if you have a background in programming, https://openscad.org/ feels right at home.

Thanks all, I have registered for the free F360 and will probably have him watch some videos to see if he can catch on easily.  

Thanks for all the other suggestions, may look at some of those options also.

Creo? What kind of a sadist are you?!

So, I really like the software on Tinkercad. Is there somewhere I can download that program or similar to my PC?

For free... Fusion 360 is hard to beat .... but I hate using it.

Free NX student version would be my suggestion

I'm not sure "catch on easily" and "3D design" hang out together much... from what I've seen it takes some dedication to get proficient with any of the tools.  But once you start getting good with it the things you can do with it today are amazing.  3D printers, CNC routers, mills and lathes, lasers...  the amount of fabrication potential you can stuff your garage with these days is impressive.  But you can't make it all sing and dance without CAD.