I've tried various splits, and my best is bi's/tri's/traps on one day, and chest/lats other day. The reason is that in my case, my tri's get worked hard by default on bench presses, so they're already exhausted and don't do as well if I to a tricep workout on the same day. When I do biceps and triceps together, it works fine, since they aren't riding each other for energy. Sometimes I'll do lats on either split, but usually they're on chest day due to wanting it to take about the same amount of time for each split day.
Charles