Overall, the differences in economics between low and high gravity worlds probably isn't significant. Low gravity would probably be better only because it makes things simpler, but high gravity has its uses.
Benefits of Low Gravity
Nearly all fuel needs are lower: Lighter vehicles use less fuel as they need to generate less force to move themselves, so pretty much all transportation costs will be lower. However, lifting stuff off-planet may not be cheaper if it has an Earth-like atmosphere: in order to achieve the same atmospheric pressure at sea level you need a larger mass of gas, which means a larger amount of gas to push through to get to space.
Larger volumes of stuff can be moved: If a mine's elevator can lift 10 tons of stuff on Earth, it can lift 12.5 tons on a world with 0.75g. If a truck can transport 10 tons on Earth, it can now transport 12.5 tons. This means that fewer shipments are needed to transport the same amount of material, which means fewer chances of accidents and lost shipments.
Safer: Falling contributes to about 1/6 of workplace related deaths. With lower gravity, the height needed for a deadly fall increases, and the amount of time a person has to grab onto something to save themselves increases. You could also save a few bucks on hard-hat material due to less dangerous falling objects.
Vertical Construction: Weight of the building, and the ground beneath it, and wind are the two major considerations in skyscraper design. Although wind will likely be similar on a low-gravity world, less gravity means less material needed to support a building. This means buildings can be taller and slimmer, as less material is devoted to supporting its own weight.
Benefits of High Gravity
Hydropower: The amount of energy that a hydroelectric dam can produce depends entirely on the pressure of water behind it. More gravity means more pressure, and more pressure means smaller bodies of water are needed to produce the same electricity. About 16% of Earth's power is hydroelectric, so a high-gravity planet could certainly benefit from cheap hydropower.
Valuable stuff: More gravity likely means a planet with a hotter and more pressurized core. More temperature and pressure means more volcanic activity, which will lead to more layers of igneous rock. More igneous rock will mean a variety of valuable stuff is common, such as platinum, chromium, and diamonds.
More funiculars: Some mines used gravity powered funiculars to get material down hills, as the heavy, loaded, descending carts were used to pull up light, unloaded, ascending carts. Not economically important, I just like the word funicular.