This crimp vs solder seems to be quite a topic:
Proper Tools and Proper Technique appears to be part of the issue. Particularly with the thick cables. The tools are very expensive to do those large crimps properly. These are not your average hand crimper.
Perhaps best to consider having a battery shop or a nautical Marine shop do it for you or rent a proper tool.
Either way - BE SURE to put the In-Line fuse in.