Soldered joints are stiffer than the wires, so you'll have a stress riser and the wires will fail right next to your soldered joint.
Why not both?
https://www.sealey.co.uk/product/5637189449/heat-shrink-butt-connector-with-crimp-solder-blue-pack-of-25
obvs if you're doing a lot of crimping then the cost adds up. But for occasional bits and bobs they have the benefits of both soldering and crimping.
@hugo7 started
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Soldered joints are stiffer than the wires, so you'll have a stress riser and the wires will fail right next to your soldered joint.