1、意思不同

compete with是和...競爭。

We ask for a level playing field when we compete with foreign companies.

我們尋求一個能與外國公司公平競爭的環境。

compete against是反對某人，與...抗爭，與...競爭。

It made it almost impossible for the smaller retailer to compete against the multiples.

這使得小零售商幾乎不可能跟連鎖店競爭。

2、用法不同

compete with 後加競爭物件。compete against後加對抗物件。

區別是：

compete with指的是和...競爭。

compete against指的是反對某人，與...抗爭，與...競爭。

例句辨析：

compete with

1、We ask for a level playing field when we compete with foreign companies.

我們尋求一個能與外國公司公平競爭的環境。

2、Kangaroos compete with sheep and cattle for sparse supplies of food and water.

compete against

1、It made it almost impossible for the smaller retailer to compete against the multiples.

這使得小零售商幾乎不可能跟連鎖店競爭。

2、You can"t compete against him, he is a top player.

你不成能和他競爭，他是個頂級運帶動。