I use Flow on the iPad by Moleskine Studios, it's priced on a subscription (reasonably priced, albeit a little annoying) but a wonderful drawing app. I use an Apple Pencil with it.
I like the ability to easily export documents and send them to my students, as well as the freedom you get with a digital whiteboard––you can drag and manipulate individual pieces of your sketch as if they were magnets on the board in a traditional setting.
The Pencil definitely does not feel like using a regular pen, but it's rather similar to writing on a whiteboard and is rather comfortable to use (you get palm-blocking and everything). If you use the first-party Notes app, you also get automatic handwriting recognition and indexing in iPadOS 14.
Assuming they're currently accepting returns given the pandemic, Apple has a relatively reasonable return policy – 14 days for a full refund provided you repackage everything, so if you find you don't like it you can just return it.
