out of those 4, for a beginner - I'd probably go for the voxel or the qidi xsmart - almost identical machines.
qidi have better support.

The best machine on there for printing is probably the flsun delta - but delta's can be tricky buggers to calibrate.
It does claim one click autolevelling - so that should remove the main issue.
I love deltas.

For the price the flsun does look like a very decent machine and we don't get many people on here complaining about flsun machines.
Honestly, I can't recall anyone.

So a toss up between the voxel/xsmart and the flsun.

The vozel has smaller print volume, but a direct drive extruder - so better for flexible filaments.
That said I have no problems printing flexibles on my delta. Admittedly my rep pro clone does a much much better job, but the delta will print the stiffer flexibles if you print slow enough.

Given the price difference, on balance I'd probably go for the flsun