I prefer koptas, as I can pull T1 strikes on vehicles (which orks have difficulty dealing with through regular means) if I get first turn, or if I don't, can use the range of TL big shootas to sit right back out of most harms way, and pick stuff off.
I have enough combat elements that reach out and get there in turn 2, so do not need bikes to fill that role.
You should ascertain which you need, based on what's in the rest of your army, and make your decision on that.
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