Well, it depends.
If you always daven with the sunrise, then - as has been pointed out in the comments - and discussed here, you should daven with the sunrise even without a Minyan.
If you're not in the habit of davening at sunrise, then the Shulchan Aruch paskens in the next Siman (90:9) that you should always pray with a Minyan.
However, the Siman continues (90:10), if the only available Minyan is going to miss "Sof Zman" and pray too late then one should pray ahead of them. (If possible, at sunrise, obviously, since that's the correct time to daven.)