Difference "not equal to" vs "not is empty"

[Wolfgang_balloni]

I want to understand,

• why is an if condition with “not equal to” not considered
  but a condition
• “not is empty” is considered
  where is the difference ?
  

[Soham_Shah]

I didn’t get your doubt

[ramrajput200021 (Techy Rajput)]

There is no difference between these blocks.
You can use any block

[Wolfgang_balloni]

Thanks for your answer,
that’s what I thought too, but for me only the variant with “not is empty” works (at least in companion)

[ramrajput200021 (Techy Rajput)]

@Wolfgang_balloni

for me only the variant with “not is empty” works (at least in companion)

I don’t have any idea about this but both blocks works for me in export apk file.

[Hassan]

You may use both. Make sure no space in the block.

[bodymindpower (Anke)]

@Wolfgang_balloni

but for me only the variant with “not is empty” works (at least in companion)

Of course, both work:

[Taifun]

@Wolfgang_balloni

where is the difference ?

learn to debug your blocks like @bodymindpower did…
see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools
Taifun

[Wolfgang_balloni]

Thanks to all for your answers !
in the end @Hassan answer soved my “problem”
Blocks from @bodymindpower are very helpfull as well as the links from @Taifun