Automatic levelling can often be more trouble than it's worth - and it's really of any use when the surface of the bed is not level.

manual ;evelling is quick, pretty simple and doesn't need to be done that often.
I don't think I've levelled my delta for at least a year :-)

The voxel is a great choice - for a couple of reasons.
1) it's actually a flashforge adventurer 3 so you can use flashprint - one of the best and easiest slicers to use around :-)

Plus often the adventuere is actually the cheaper option.

Monoprice do not make printers, they just buy them in and rebadge. Some are not great quality. But flashforge are one of the oldest and best manufacturers around.

They will use any filament - for most you just use an external spool mount.

Not sure how the wifi is implemented - but given that it's flashforge - it will probably stream the entire file to the printer and then print without needing the computer.

Avoid the xyz's the cheaper units tend to have a lot of problems.
The select mini is okay - but niether of them are even close to the adventurer - um, voxel :-)

It's worth the extra money and you'll be surprised just how much stuff you can fit on a in a 150mm cube. It's larger than you think.

So yeah, good choice - go for it :-)