GEDCOM is the only de facto standard, supported by practically every genealogy product and service.
Transfer through GEDCOM can work fine, but can also be problematic.
GEDCOM is not perfect, and the quality of GEDCOM support varies greatly.
Any specific problem you encountered may already have its own topic.
FamilySearch stopped maintaining GEDCOM.
Many alternatives to GEDCOM have been proposed, none have gained wide adoption.
An extensive overview of GEDCOM alternatives is not hard to google.
Many products will import directly from a short list of competing products.
A third-party conversion tool, called AncestorSync is likely to become commercially available late this year.
There have been several attempts to create organisations for genealogy data standards, most recently OpenGen and BetterGEDCOM.
The BetterGEDCOM project led to the creation of Family History Information Standards Organisation (FHISO).
Major genealogy software vendors have joined as founding members.