Really, you need both. But a general purpose zoom is called that for a reason. If your only lens is a 70-200, you'll miss a lot of shots because you just can't back up far enough.
For weddings, a telezoom is almost always needed during the ceremony. For sporting events, the 70-200 would be better.
Honestly, if you can't get both very soon, you need a stopgap. Get the 24-70 II and a longer prime, or the 70-200 II and a shorter prime. For example, the 40/2.8 and the 70-200/2.8 II is a combo that I often use for events. The 40/2.8 goes in my pocket, the 70-200 on a blackrapid strap or spider holster, and when swapping on the pancake, I leave the 70-200 connected to the strap/belt.