Most businesses use a RedHat based distro, so that would be my number one choice.
1) RedHat Enterprise / CentOS - stable vendor supported , long lifetime 5+ years
2) Fedora / Ubuntu - usable desk top linux, new slightly broken , life time is short < 1 year
3) Gentoo / Slack - for people who enjoy doing everything by hand themselves,geeks and those with too much time and so on.
4) Puppy / DSL - for poeple with only an SD card for a hard drive, or an uber low power pc.
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