All other things being equal, the power output rates differ greatly because of the difference in efficiencies. Solar panel efficiency shows solar panel's ability to convert sunlight into usable electricity. Given the same amount of sunlight shining for the same duration of time on two different solar panels, the more efficient panel will produce more electricity than the less efficient one.
Most solar panels are between 15% and 20% efficiency, but high-quality solar panels can exceed 22%. There are several factors that contribute to this:
These factors largely influence the price, so high efficiency solar panels tend to be 20-50% more expensive than their less efficient counterparts. However, they will allow you to economize in the future. Firstly, they are high quality panels with low degradation rate. Secondly, they'll save you some valuable space on your roof. Finally, they can be all arranged on the south-facing side of the roof to harvest the most power.