Option 2. Chisel a bit away from the pipe, and don't direct force at the pipe when breaking out concrete around the pipe. You can also make cuts with a diamond saw to make chiseling easier.
It's utterly normal to need to break concrete around DWV pipes. They are fairly tough, if you use reasonable care. If you screw up, break more concrete until you can get a coupling on with fresh pipe. If the concrete is freshly poured, get to it - every day, every hour you wait, it gets stronger, so the time to correct your mistakes with a fresh pour is as soon as possible, when the concrete is still weak.
Since this tends not to be as common knowledge as it should be, a graph of concrete strength gain [via damp curing - if the concrete dries out, it stops gaining strength; concrete sets and cures, it should never dry] in the early days:
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Note how fast it's increasing over the first week. It really makes a huge difference to get to chopping it as soon as you can.