Group work will take more time than if I did it myself
Fact or Fiction? Fact
There is no way around this, so be prepared. Even if you divide up many of the early tasks (research, etc.) which lessens the time you might put in individually, writing a collaborative paper takes a lot of time. It's time well spent as the final project is usually better than what any one individual could do, but don't fool yourself into thinking choosing a group option will mean less work. It hardly ever does.