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Question: when to use evalindets vs. subsindets

Question:when to use evalindets vs. subsindets

nm 7825 Maple 2022
subsindets evalindets
February 15 2023
3

Are there rules of thumb to follow to decide to use evalindets vs. subsindets?  They seems to do the same thing, but I did not read every details of the help pages.  Is the difference similar to difference between using eval vs. subs? i.e.

          eval(expr,A=2)

vs.

         subs(A=2,expr) ?

For example

expr:=ln(A)+ln(B);
evalindets(expr,`&+`('specfunc(ln)','specfunc(ln)'),f->ln(op([1,1],f)*op([2,1],f)));
subsindets( expr, `&+`('specfunc(ln)','specfunc(ln)'), f->ln(op([1,1],f)*op([2,1],f)));

Both give
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