toss-up

/T AO1 S AH0 P/
noun
  1. 1

    A decision in which neither choice is clearly favorable or unfavorable, or for which the outcome does not matter.

    โ€œIt's really a toss-up between the red skirt with blue stripes and the blue skirt with red stripes. They both look good and fit well.โ€

  2. 2

    Either of two outcomes that are equally likely.

  3. 3

    The toss of a coin used to decide some issue.

Source: https://en.wiktionary.org/wiki/toss-up