You should almost certainly choose UCSF ChimeraX. UCSF ChimeraX is the official, next-generation successor to the legacy UCSF Chimera platform. While both are powerful molecular modelers developed by the Resource for Biocomputing, Visualization, and Informatics (RBVI), original Chimera has reached its end-of-life stage and is no longer actively supported or updated.
The structural comparison below highlights the technical differences to help you decide which tool fits your specific workflow. Feature Comparison UCSF Chimera Home Page
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