Javascript nested ternary vs switch case. Which is better?

javascript-nested-ternary-vs-switch-case.js

# Easier to copy paste from what I was doing. Working on a React Component.
# Was working with React and d3. So the functions are imported from d3.

import { axisTop, axisRight, axisBottom, axisLeft } from 'd3-axis';

# Ternary example as a small function
ternaryEx = ( bootstrap ) => bootstrap === 'top' ? axisTop : 
  bootstrap === 'right' ? axisRight : 
  bootstrap === 'bottom' ? axisBottom : 
  axisLeft;

# Switch example as a small function
switchEx = ( bootstrap ) => {
  switch( bootstrap ) {
    case 'top':
      return axisTop;
    case 'right':
      return axisRight;
    case 'bottom':
      return axisBottom;
    case 'left':
      return axisLeft;
    # This could be left or whatever you want the default return to be
    default:
      break
   }
}