Hi, I haven’t used the nskha one but from what I understand it is based on openai powered search of documentation and node metadata etc so it might be more recent / more accurate. Having said that openai is payable, no free option. On the other hand Google ai studio with flash 2 is still mainly free. So it’s preference I guess. In recent days I was blown away by 2.5 pro. Only a limited amount of free daily use is allowed but overall it isn’t a problem. I would say it is shockingly good at creating setups based on very specific requirements (it’s not perfect but close) and most importantly it can help you reason as to why things are like this and that ans some things won’t work.
Like anything, try out something and if it fits your needs that’s your tool.
Currently for me, I use openai for the integrations on N8N since it is better supported and has less problems. For anything else, outside of that I prefer Google ai studio (although you might like to tell it to keep things concise 
)