Product hunt is awesome platform for tech products we built up the most innovative App for MacOS specially which is WebRemarks. It's the best app for taking screenshots on mac and share with your friends.
I agree w/ @talia_basma but let me add a bit more context.
TikTok: Great for Gen Z pull and something that resonates w/ younger audiences. Also great marketing but expect very low conversions from TikTok itself (Think of it more as a visibility provider)
Twitter: I am not sure exactly which niches work great on Twitter, possibly all of them, but they have a bustling Web3 and AI community as of right now that I'm aware of. Great for building investor awareness too and having a strong clout on Twitter is the highest social signal of all the platforms.
LinkedIn: Perfect for more mature / professional audiences and can target specific industry niches. Great for B2B as well since you can target specific customer personas through your content.
Reddit: Also great like LinkedIn especially if you're hyper niche and solving a specific problem for a specific community. Doesn't work well for more consumer-oriented tech (or at least I haven't seen any brands that have chose Reddit as their main platform for branding)
PH: Generally great for any company especially if it resonates with a wider variety of tech builders / enthusiasts.
I think the answer also depends on the product/company. I do think Product Hunt is a great place to share certain products, but I could see others getting buried if they aren't a "tech-forward" company. Twitter was probably a top go-to but I wonder if that will be the case as Elon Musk continues tinkering around with it.