Body Welding - cylindrical or conical nozzle?

[Daverham]

Hi guys. My little used MIG welder needs a new gas nozzle. I can get replacement parts online. Great. There are conical nozzles and cylindrical nozzles available.

http://www.usaweld.com/Silver-Beauty-MIG-Welding-Gun-Parts-p/silver-beauty-mig-parts.htm

Telwin "Multi-Mig" if anyone is curious.

I've been doing OK with the existing cylindrical nozzle (until it shorted out and then fell apart). Just wondering what's really recommended for sheet metal work. Why do these two options exist?

Thanks.
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