This is the 1866th most frequent Japanese word.
比べる
To compare.
In this sentence, "比べて" is used to compare two items (today's and yesterday's cakes) and indicate a contrast between them.
このケーキは昨日のケーキと比べておいしい。
This cake is tasty compared to yesterday's cake.
Here, "比べても" emphasizes the comparison of his running ability with that of his classmates, highlighting his superior speed.
彼の走る速度はクラスメートと比べても速い。
His running speed is fast even compared to his classmates.
Here, "比べると" is used to showcase a comparative evaluation based on a specific metric—population density.