Brand doesn’t matter afaik.
They are simple metal parts so they’ll last forever, unlike the plastic ones.
The rubber seals and o-rings are standard parts that can be easily sourced and replaced.
Grease can help seal them, however it also attracts dirt so not ideal.
If you search for ‘Fiber reinforced hose’ you should get something comparable (cheaper than anything that’s labelled ‘military grade’ and fit for a lot of water lines PVC is decent and cheap, but if you’re using it for drinking water try and get something that’s silicone, just for safety’s sake