Done properly, crimping wins hands down.
That means the correct tool for the crimp and a ratchet type crimp tool (in good condition), so the tool will not open untill enough pressure has been applied.
This produces an air-tight cold weld, which is better than a hot weld unless the hot weld is done under an inert gas blanket, to keep the oxygen away while the metal is hot.
Sorry guys, but solders, even eutectics, do oxidise over time. Thus solder can carry oxidation into a crimp more than would otherwise happen.
When researching crimping for a production line situation, the experts advised against soldering over a crimp.
If you want to seal a crimp (not bad if you want really long term protection) many of the elecrtonic parts warehouses sell products for that purpose. Otherwise nail varnish is a fairly OK substitute, and putting adhesive lined heatshrink over the top helps a lot also.
Just be aware that a poorly done crimp is about as good as a cold-soldered joint.
