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Life-Gain - This is an ideal Zombify effect in life gain which is the most registered archetype in the Commander format according to EDHREC.com

That said, both Swords to Plowshares and Dispatch are more than playable, and I think which you pick first will depend largely on what your deck is trying to do

Which should you start with

My last two choices are so good, they were reprinted in the Doctor Who commander decks, but these cards are originally from Modern Horizons 2 and Amonkhet

It allows you to look at the top of your deck at any time, and you can play the top card of your library if it's a land and an opponent has more lands in play than you