Alpha refers to the % outperformance by funds over and above the performance of their benchmark.
It is a measure of outperformance and thus higher alpha represents a better performance keeping other factors constant.
For example : Fund A’s returns are 12.5% vs its benchmark’s returns of 10%, that makes Alpha = 12.5% - 10% = 2.5%
Similarly, Fund B belongs to the same category as fund A and has returns = 15% & thus an alpha of 5% representing outperformance over both its peer fund and its benchmark.