I discussed this with a SPSS guru. In his opinion there are 2 differences. The end of command and the start of a continue line.
By the last I mean:
for interactive mode:
VALUE LABELS d4
"1" "Ja"
"2" "Nee".
for batch mode:
VALUE LABELS d4
"1" "Ja"
"2" "Nee".
I personal would advice everyone to use the last syntax, but some setups are generated using the first. And SPSS uses the interactive mode in the syntax editor..... I think using interactive mode would make PSPPire more compatible to SPSS, and I don't see drawbacks for it
Have fun