Roosters in general have much larger, redder combs and wattles than their pullet counterparts at the same age. I don't notice a difference in behavior until maturity, but I don't usually watch mine too closely. If you compare a rooster to a hen of the same age, they will look very different. Age is also a consideration. Under 10-14 weeks, the only thing defining a rooster from a hen is appearnace. At about 10-14 weeks or even alter the young roosters start to crow. Some breeds are easy to sex, others are not. I usually can tell by the comb in a couple of weeks. Others can tell by color and size. I think the best way to learn is by trial and error
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