PCML pros/cons

Greetings,
Currently using PCML to call RPG programs from Java for a long time and now evaluating on using HTTP CGI RPGLE programs to produce/consume JSON content as an alternative.. so may i kindly ask you about a comparison between the PCML and the CGI RPGLE programs and evaluation on using each of them from the performance point of view

Any help would be appreciated.
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Thank you,
Nihat

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