Advice needed - Ladybug or DIVA?

I have zero experience in doing environmental simulations. I came across the tools Ladybug and DIVA and wondering which one to learn. Both seem to serve the same purpose. Does one offer any advantage over another?

Quote from Food4Rhino for Ladybug:
Ladybug allows you to import and analyze standard weather data in Grasshopper; draw diagrams like Sun-path, wind-rose, radiation-rose, etc; customize the diagrams in several ways; run radiation analysis, shadow studies, and view analysis.

Quote from DIVA’s website:
DIVA-for-Rhino is a highly optimized daylighting and energy modeling plug-in for the [Rhinoceros] - NURBS modeler. The plug-in was initially developed at the Graduate School of Design at Harvard University and is now distributed and developed by Solemma LLC. DIVA-for-Rhino allows users to carry out a series of environmental performance evaluations of individual buildings and urban landscapes including Radiation Maps, Photorealistic Renderings, Climate-Based Daylighting Metrics, Annual and Individual Time Step Glare Analysis, LEED and CHPS Daylighting Compliance, and Single Thermal Zone Energy and Load Calculations.

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