In Mandarin, 或者 is exclusively used in statements, while 還是/还是 (háishì) is only used in questions. The inclusion of 還是/还是 in a sentence replaces the need for 嗎/吗 (ma) as a question word.
In Cantonese, 或者 is exclusively used in statements, while 抑或 (jik1 waak6) or 定係/定系 (ding6 hai6) is only used in questions.
Maybe in a certain episode, I can lift my head up and admire you; maybe one second later I will lose you; maybe [I] have gone through too many things that [I] forgot how to embrace you; maybe [when I] hold [you] tightly, you have already breathed your last.