Should I upgrade to a better pc or a better phone?

I currently have a terrible computer, at least 7 yrs old (ASUS laptop) I also have a terrible phone (iPhone 5c) which should I upgrade first? I was planning on getting a better pc, but than I realized how bad my phone was.

You know your experience with either & therefore should know which you think is worse & which you think you could manage with a little longer in the meantime