Do you recommend upgrading ChatGPT to ChatGPT Plus?

If you are not that heavy a user and you do not need other associated benefits that come with the subscription, then you are better off with Perplexity AI pro. You get access to the higher models of OpenAi plus access to Claude, grok, Gemini and others

i think basic model is good and there is no need to go for upgrade and waste money. again use case depends upon requirements of user but i will prefer free models

Yes, it's worth it. Don't see much difference between PRO and PLUS tho. Unless you deal with very heavy workload and need more memory for tab