It will be the one you use in decent seeing, to look at the Moon, planets, and double stars. The other one will give brighter images of faint nebulae and galaxies, and so make them easier to see than if their limited light were spread wide, by high magnification. The low-magnification eyepiece will also do double duty for finding things. For the low one, if you are on a budget, get a 20 mm Erfle from Pocono, or find a used one with another label. With a two-inch focuser, Meade, Pentax and University Optics have suitable 40 mm eyepieces.
None are cheap.
Many of these telescopes come with a decent 25 mm or 26 mm eyepiece as standard equipment. If so, keep it for a while, and just buy the 10 mm. The focuser restricts the field of view, but there are lots more eyepieces to choose from at 1.25-inch diameter than at 0.965. You can then go for a 10 or 12 mm Orthoscopic or Plossl, and a 40 mm Plossl or Kellner. If the hybrid diagonal does not work for you, you will have to hunt down eyepieces with 0.965-inch barrels in appropriate focal lengths.