as with everything, it's what you are willing to spend...
i run killer crimps, mainly cuz i have to in the boats... the CG wants mechanical connections... if you aren't sucking a ton of amps, you could solder, i have done it on my rigs in the past, but i still prefer a good mechanical crimp...... this is the crimper i run, but there are cheaper options, hammer-smashes work ok...
https://www.anythingtruck.com/product/810-058171.html
for wire, while welding cable is definitely a step above standard low strand cr@p the parts store is gonna sell you, it's not the best choice and does have its pitfalls... while VERY flexible, which i love, it is HORRIBLE when it comes to oil... it'll swell that sh*t real quick if it gets gooey..
tinned marine is the best you can run, it dogs welding cable.. same high strand counts, but it's tinned to help with corrosion tremendously and has a killer jacket.. only thing welding has over it is, it's a bit more flexible.. but marine cable ain't cheap.. dhcomp will testify to that..
