I think usually a question about what you like does not call for an answer “I like X because it costs less”—that’s more of an economical preference. Either way, keep in mind that this lower cost for you in the moment, monetarily is in large part due to most governments presumably subsidising oil and due to negative environmental externalities both from plastic pollution and other uses of oil.

(I’m sure, like with any question, there will be many vocal commenters chiming in saying how they like plastic. All I can say, lucky you, and I am yet to meet any of you IRL!)