How is Whisper different from Nemo?

[BradKML]

Since nVidia has Nemo while OpenAI has Whisper, I would like to know the key differences https://github.com/NVIDIA/NeMo

And weirder still there are a lot of models that beats Whisper Large v3, like Parakeet, Canary, IBM's Granite, and Microsoft's Phi-4 https://huggingface.co/spaces/hf-audio/open_asr_leaderboard