up to you, the corals would be fine with the 1200s, I don't know your setup but the wattage difference will add a lot more heat to the setup.
I have 1180gph running through my 25g display (2 x PanWorld50px) it look a lot of adjusting for the sandbed to stay put. I have a mixed reef, softies are Kenya Tree, Toadstool, and Xenia)
I mostly have experience with smaller tanks so you may be better off using someone else... the 230gph x 3 will give you roughly 10x an hour turnover which is enough IMO for softies but more wouldn't do them any harm and may help in other ways.