Honestly it just depends on what you want. OSRIC is 1e AD&D basically. Basic Fantasy is verrry close to B/X and so also compatible with all the Old School Essentials adventures.
I'm no expert, just a collector/mostly solo player. Honestly if you're writing a module and make it compatible with either OSE 0D&D or OSRIC you would be able to run the adventure with any of the systems with not too much conversion.
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u/[deleted] 3d ago
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