I'd have neither. Handscomb can keep, and Phillippe can be his back-up as well as a reserve batsman.
My squad:
First XI
Warner
Short
Smith
Marsh
Maxwell (c)
Handscomb (wk)
Cummins
Starc
Richardson
Zampa
Hazlewood.
Some will say long tail but they can all bat, bar Hazlewood, and gives us no weakness in the attack.
Reserves:
Stoinis
Phillippe
Worrall
Boyce
Khawaja and Stoinis faced 129 balls between them, for 87 runs. That's 43% of your innings. Stoinis leaves half the balls he faces, even slow juicy mediums outside off that scream "hit me for 6 over cover!" Both of them fail to score from far too many balls. Dot, dot, dot. They don't know how to work the ball into the gaps or drop and run to turn the strike over. Can't winn a World Cup like that. We can win a World Cup with my team.