[May70]

I use marine grade heat shrink & crimp connectors with a ratcheting style crimp tool like the tool aid version (they sell versions on amazon for like 10 bucks). The tool has a specific way the connector needs to be positioned to crimp it good. Once you get the hang of it, its a breeze. Ive been putting them on boats for years and not had the first one fail. Trailers, cars, etc..

The style with the heat shrink and solder I do not like. The cheap connectors are horrible. Quality connectors are going to be expensive.

I have probably soldered 2-3 connections in 5+ years. Maybe that's better than the marine grade but I doubt it. I'm around salt water and rough rides so these have passed the trials.