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There's two things to consider. Firstly is the FoV you get, 280 is very wide, but can create some beautiful views of the larger nebulae, or group multiple objects together into a single image. Of course, you do sacrifice resolution/detail since you have the wider FoV.
I would argue the bigger consideration is the increase in imaging speed you get. F/3.9 is a full stop faster than F/5.6, this means that 1 hour of imaging at f/3.9 is the same as imaging for 2 hours at F/5.6. I would argue that time is our biggest limitation with this hobby, and this allows you to either double the effective integration time of your images, or image twice as many objects in the same time.
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