I agree with this. It's best if it involves you and makes you feel enthusiastic about writing, because some days you will just not have that energy, and it's much easier to produce something that comes easily to you than it is to produce something that is a huge challenge.
There are indeed pros and cons to either approach. On the whole, I have felt in past that gag-a-day strips that try to engage in ongoing storylines tend to lose my interest. It's also worth mentioning that more authors who find gag-a-day standalone strips to suit their expression tend not to write an ongoing narrative like I enjoy, and the storylines they tend to engage in usually don't give enough "rest points", so the pacing is exhausting. With the format you've used up to now, I feel that if you should choose to do story arcs, I'd advise them to be light ones that are secondary to the character interactions and jokes you want to tell. Stories like 'character A goes to a library to look for a book' are usually more fun for me as a reader than 'character A and character B come together to flee a common enemy after accidentally destroying that enemy's car'. It still gives you a goal, it's still something that can be a story that takes multiple strips to tell and can lead to plenty of jokes, but it's not something where the reader is going to be worked up and then left tense until the story ends.
I tend to read standalone gag-a-day type comics to relax and get a chuckle, and usually if the strip resonates with my sense of humor, I read a lot at a time and keep it bookmarked so I can come back to it later and read more. If I'm being honest, most gag-a-day comics that tried to have SRS BZNS storylines did it poorly compared to their initial format and lost me as a reader because of it.
That's not to say everyone is the same way! But that's my experience.
