Good quality beginners printer - Which of these would you suggest?

[curious aardvark]

do not touch ender 3 with a VERY long board !
terrible design, lots of issues and just don't !

For nylon you really could do with an enclosed printer.

have a look at this: https://www.amazon.com/Monoprice-Rem...r=8-3-fkmrnull

Not the largest print volume, but as close to plug and play as you can get.
with the serious bonus of using the flashprint slicer rather than fighting with cura.
That's because it's actually a rebadged flashforge adventurer 3.

The anycubic is a much better machine than the ender - but it's still an unenclosed i3, so you'll still have to fight cura and for nylon a heated enclosure is a really good idea.
Plus on the same site that says there's a new best printer under $300, they also list 16 modifications you should probably do to it.
Plus both printers use fairly long bowden tubes - an i3 should be direct drive. Bowden setups are fine, but will struggle with the softer, more flexible filaments - like nylon.

Yeah you can buy simplify3d for a decent slicer - but that pushes the cost up another $100 or so, flashprint is as good as s3d and free, as long as you have a flashforge or compatible printer :-)
I use it on my klic-n-print replicator clone and I also have simplify3d, but for the knp I prefer flashprint.