Hi friends , in mapping program ,which is better one.why? explain me.

1)In mapping program ,which is better one.why? explain me.

Actually the sequence is
Graphical
Java
XSLT
ABAP
graphical mapping can prove to be the simplest of all mappings and easy to so also as u have a mapping editor and standard functions available.
when this becomes too complex v generally opt for java / xslt mappings.
when u are much comfortable with abap u may also opt for abap mapping.
still the choice depends on scenario. performance wise graphical and java mappings have
good results (also depends on ur code in java mapping).
refer this:
Comparing performance of mapping programs:
/people/udo.martens/blog/2006/08/23/comparing-performance-of-mapping-programs

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