if the op isasking about best clamps , surely he isnt talking about hydraulic oil lines but engine oil lines . you wouldnt use a clamp on a power steering line ???
so assuming engine oil - of their type best clamps Mikalor IMHO
Hoses if you are being picky then made up by specialist like proline - but then they wouldnt use clamp either bolt in/up unions each end machine crimped to the hose.