Sorry for the delay, and thank you to everyone for your replies. I appreciate them!
Basically, I want an iPad where I can use the internet and internet based Apps (like twitter, etc).
I think it would be a great tool. I also want to take notes and put ideas down. I think a pencil would be helpful for that.
I don't see myself using a keyboard, but a trackpad would come in handy at times as well, so I can click easier instead of tapping with my finger especially when sitting at a table with the iPad propped up on my table.
That's about it. I don't need cellular, or anything like that. I think the mini would be too small of a screen.
Based on what you're saying here, I'd recommend going with the entry level iPad (8th generation). It has a processor that is BEYOND capable of doing the things you mentioned and then some.
The only reason to step up to the pricier iPad Air 4 is if you prefer the aesthetics of it (lack of home button & bezels). But as far as performance goes, the 8th-gen "regular" iPad will handle stuff like Twitter, Facebook, YouTube, emails, web surfing, and messaging just fine. It even supports the 1st-generation Apple Pencil for taking notes or sketching.
What do I strongly recommend is going with the 128GB storage option. The 32GB that comes as a base option is a joke by today's standards and you will be frustrated sooner rather than later when you start getting notifications that you're out of space. You want to have enough storage for apps, pictures/videos, music, etc. And future iOS updates tend to be hefty, so it's better to have the extra storage space for that as well.
128GB 8th-gen iPad $429 + 1st-gen Apple Pencil $99 = $528
That's $70 cheaper than the Air which only comes with half the storage (64GB) and it would cost you additional $129 for the 2nd-generation Apple Pencil that it requires.
Amazon right now has the 8th-gen iPad and 1-st gen Pencil on sale for $395 and $95, respectively. And with Black Friday sales right around the corner, I'm sure prices will drop even more. So if you can wait a few more weeks it could be well worth it. In the mean time,
here's a 6-minute video of the iPad from the event last month. You can see here how well it works with the pencil for note-taking.