With Hillary, we have her actual track record (encouraging Bill Clinton to bomb Kosovo in the '90's, supporting the Iraq war in the '00's, urging Obama to bomb Libya and expand operations in Syria as Secretary of State, etc). As has been often said, there is no war that she has said no to.
Trump has no track record in office, but expressed opposition to the Iraq war (he claims before it started, but certainly by 2004 and since), wants to reduce our involvement with NATO, wants to negotiate a fair deal between the Israelis and Palestinians (instead of demonizing the latter), supports having a non-belligerent relationship with Putin, stays independent of pro-war mega-donors, etc.
IOW, Trump is a "Jacksonian" interventionist, who believes in projecting strength and fighting short term conflicts that are directly in America's interest, but is not a neocon interventionist, who subscribes to their full agenda of regime change, nation-building, global empire, belligerent diplomacy, Israel-first mania, and no-exit/no-win wars.
Hillary, by many miles, is more pro-war.