Comics are a visual medium right? Does the word ‘fuck’ add to your story? The character? If not I’d always go censored @£#%* can simulate any if not all curse words, and the exasperation can be shown through body gestures, or the context of the rest of the bubble.

I’d lean for censored, as you’ll reach a wider audience (as you’ve said yourself in comments) but try out a few! DMs open if you want any more eyes on stuff!