One thing to realize up front is that the expectations for the featured/paid webtoons are generally different than those placed on Canvas creators. Most readers understand that Canvas creators aren't doing this as a job, and thus most of them have other responsibilities on top of making their comic. As a result, either shorter episodes or less frequent ones are normal and understood.
That said, when picking a length for your comic, it's worthwhile to consider the following factors:
1.) What works best for your comic?
Some comics like comedy strips work really well with short panel counts, as adding too many more in would ruin the pacing of the joke. Others, like drama or action stories, may read better with longer episodes that allow you to get through lengthy conversations or action sequences in 1 go rather than breaking it up into a bunch of pieces. If you look at your script, think about how much you would prefer to get in one episode as a reader.
One thing to note as a Canvas creator is that, especially early on, most of your visibility on the site/app will be through the "recently updated" section of your genres. Aside from that, once you get pushed off of those lists by other series updating, you'll largely be invisible outside of the occasional search or whatever external promotion you do.
With that in mind, it's best to post more often if possible for maximum visibility. A lot of creators aim for weekly updates similar to many of the featured series as a result. If you post less often, then you have to accept that you'll have less eyes on your comic, generally speaking.
My experience has been like this:
My first comic was a story driven one-shot. For that one I decided to do 1 page per week (about 5-7 panels), so I prioritized visibility (frequent updates) over ideal reading conditions (In this case, I think my episodes would have been better to read if they were longer).
My current comic is a slice of life D&D comic. For this one I'm trying the opposite approach: I'm only updating once a month, but with 15-40 panel episodes. In this case I'm going with the panel counts that feel the best to read at the expense of visibility.
After this current comic is done I'll have to compare and contrast and see which approach worked better lol. My new comic is still pretty young so I don't have good data