其实这两个句型完全不一样的,可比性不强呢
try one's best to do sth“尽某人最大努力做某事”用的范围更广,应该是与as...as I can 更接近,请看下面的例子吧：
I will try my best to make ends meet.我尽力做到收支平衡.
这句话也可以说成,i will earn as much as possible to make ends meet.
或者 I will earn as much as i can to make ends meet.
另外与try one's best 的近义替换应该是do the best one can,或者是make the greatest effort