に越したことはない => It’s best that, There’s nothing better than ~ N2
に[越「こ」]したことはない => It's better if A, it's better if it's A N1
Comparison/ Exchange
だけしか~ない => only N3
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
だけましだ => It’s better than; One should feel grateful for ~ N2
だけしか => Only A can B , Nothing except N3
Not only, Not even
[使「し」][役「えき」][受「う」]け[身「み」] => Imperative N4
Causative, Passive, Volitional
につけ~につけ => each time, whenever, either way N2
だけましだ => Although A, B is (still) true (and is good) N2
Contrast,Surprise
...かける => Impact N3
Act
だけ => only; just N5
…けれど => Explanation N3
Exclamatory