Which screen resolution (Largest or smallest) is best for developer hand-offs?

I am currently designing a web app to cater for the following screen resolutions:

  1. 1920 x 1080
  2. 1600 x 864
  3. 1366 x 768

I'm wondering:

  • Which is the default/primary resolution I should design in for developer hand-offs. (It's a huge web app and I can't possibly replicate it in all the resolutions.)
  • What trade-offs am I making, or what precaution should I take if I select 1 resolution over another. (I'm currently inclined to design in 1366x768 since it's easier for developer to imagine scaling up)
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