What is the best way to connect H/U wiring loom to a wiring harness? Soldering, crimp or twist and tape?

Thanks for looking?

 

stay away from twist and tape.. not very mechanically sound.. I prefer solder connections, once done, they are very mechanically sound, conduct well, and wont fall apart over time. Crimp conenctions are pretty good if done properly too.

 

Solder every thing then heat shrink it. Youl ge glade when u know future possible problems will never be u'r conections.