Are you comparing an old design to a new one? If so, and the variance is so little, stick to the old design. This is because you haven't fully tested the variances over a long period of time, and therefore if your new design is not obviously better, then you're risking a long-term dropoff for no measured gains:
Tyler Roehmholdt, Web Marketing Manager at Campaign Monitor
For an inconclusive test, oftentimes we’ll stick to the control if it’s a change to something that already exists on the page. If we went with the new variation, at best it will perform the same as the original over a longer period of time, at worst we’d see a decrease in conversions over time. If it’s a new addition to the page, we’ll be much more open to promoting the variation to production.
In fact, researching this, there's a good Stack answer here.