In theory, a static IP is less secure since that's the one you always have, but to be honest either are equally insecure if there's a lack of security at the user's end of things.
It's not the IP as such, so much as the presence. If you have a NAT router between the IP and the PC (so to speak), it's far more difficult for nasties to probe up to the PC. On top of that, a software firewall on the PC is a must.
When I first got connected on 56k, I had a software firewall and no NAT. My firewall had regular probes. Since getting a NAT router, there are next to no nasties appearing on my software firewall.
A static IP is good for certain things. See here:
As far as I know, some speedtesters log your tests by IP, so keeping a record of your tests might be a problem with a dynamic one. If you reboot the router the dynamic IP will probably change (but not always).
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