Your handwritten lettering, in my opinion, looks best with your illustrations. It looks more organic versus the font you used in your first linked example. Even in the way your placed the text, it just looks like a better fit (though I would recommend you avoid writing on a slant).
For some, doing handwritten lettering can be time consuming and tedious considering the length of one's work and the need for text to be legible and consistently uniform. Having a digital font can be convenient. Luckily, there are a LOT of pretty good ones out there that you may find similar to your own hand writing.
Otherwise, I personally prefer your handwritten lettering over that particular font. Your comics are short (and humorous judging from the coffee one, hehe) so it may come down to how much time and energy you want to invest over time.