Mainly just that it runs from usb. By default sd access is disabled when running sneek from sd, but not uneek from usb. You can toggle sd access for sneek in the options but it carries some risk of corruption.
If running neek2o, I think the +di version is ideal, but only really needed if you are booting into neek and loading disc titles via HDD using the DI menu (not necessary if using a usbloader)
When selecting what version to build, modmii will describe each and some pros and cons.
Yeah well the problem is I have the same results with UNEEK, black screen and nothing happens. As I said before, I appreciate your attempts to help me but this is just useless with talking back and forth, again, because as it seems I am not able to boot into emuNAND and I really don't want to try out just all the possible combinations, there has to be an other issue I am overlooking.
For example when I rename the bootmii folder nothing happens at all when try to start BootMii, when I leave it named to bootmiineek at least the DVD drive blinks blue as indicatior that something is happening at all, yet I bet this is only the signal that BootMii can't find the files.
Again no offense (I can't stress this enough because I appreciated the attempt) but I slowly get really frustrated with this, and in my opinion (as someone who helps others on forums or Discord servers regarding Switch consoles) this help here isn't enough for me, really I try and try and am absolutely sure that I don't forget something like the usual person that claims something doesn't work out of the box, and it just won't get in my head why the f this damn emuNAND is not working and how I could make it work. I mean according to you and your tool it's just drag and drop, but apparently it is not.
EDIT: Maybe your program's output helps.
===============================
4.3E Emulated NAND created by ModMii on 09.05.2021
==================================================
setting.txt built using this serial: LEH133789940
Priiloader v0.9.1 Installed
nSwitch Channel Installed
Post Loader Forwarder Channel Installed
cIOS249 rev14 Installed
Photo Channel Installed
Internet Channel Installed
Weather Channel Installed
News Channel Installed
Mii Channel Installed
Shopping Channel Installed
Wii Speak Channel Installed
NMM (No More Memory-Cards) Installed
CUSTOMIZED NOTES FOR YOUR BUILD OF NEEK:
* When launching any form of SNEEK for the first time, it could take a long time
to load the System Menu, but it will be much quicker the second time around.
* If you have problems loading your Emulated NAND, copy cert.sys
from an original nand dump to your emulated nand's sys folder.
* You can manually override Bootmii to launch neek by renaming
your BootmiiNeek folder to SD:\Bootmii and launching "Bootmii"
* You can launch uneek (or uneek+DI) without requiring an SD Card
using USB-Loader GX. USB-Loader GX also has an option to copy
a console's SYSCONF into your current emuNAND (channel) path,
so if you add new controllers or a balance board to your NAND,
use the copy SYSCONF feature to also put it into neek's emuNAND.
* SD:\Bootmii is not required to launch neek from USB-Loader GX.
If you use USB-Loader GX's EmuNAND neek feature, you can have both SNEEK and
UNEEK at the same time (with or without DI). ModMii will detect SNEEK when
installing UNEEK and vice versa and ask if you want to overwrite SD files.
For dual boot you will want only SNEEK files on SD and only UNEEK files on USB.
The version of SNEEK\UNEEK that will be loaded is based on your EmuNAND
location in USB-Loader GX's settings: Sneek if on SD, and Uneek if on USB.
* Install the neek2o channel using YAWMM then launch the channel in order to
start NEEK. You can also use this channel to return to your real NAND.
* To add Games to the Game/DI Menu, you can use ModMii, WiiBackupManager
or wit.exe to extract Wii Games in neek format to your FAT32 USB Hard Drive.
neek2o is also able to load standard game file formats from USB:\WBFS.
* When using SNEEK+DI or UNEEK+DI, you can access the Game/DI Menu
by pressing "1" on the Wiimote. To access other settings
(including Region Options), you must press "+" from within the DI Menu.
* ShowMiiWads can be used to decrypt your real Wii's Bootmii NAND
dump (nand.bin) to use as an emulated NAND, and it can add custom
channels/WADs to an emulated NAND. See ModMii's Download Page 2.
* For more SNEEK info, like formatting a USB Hard Drive for SNEEK,
or installing the HBC to an emulated NAND, visit: tinyurl.com/SNEEK-DI