I'm guessing you don't like 21:9 because it's too wide relative to its height, or put another way it's not tall enough relative to its width. If that's the cas

I'm guessing you don't like 21:9 because it's too wide relative to its height, or put another way it's not tall enough relative to its width. If that's the case, 24:10 would be even worse. Don't be misled by the :9 vs. :10 part - that is meaningless. Reduce them both to a single number for a fair comparison: 21:9 and 24:10 are 2.333:1 and 2.4:1 respectively.