Should I train biceps and triceps together?

[gmscorpion]

Or is it more effective to train biceps with back and triceps with chest?

either way is ok. But I prefer isolating my arms meaning I train Biceps and Triceps same day. Sometimes alternating muscles between sets and most of the times alternating muscles between exercises.

[CeePee25]

you don't necessarily have to train both biceps and triceps on the same day. But if you do, do all triceps exercises before you start biceps.