It's seriously not even a reasonable question unless you simply don't have the $. In fact, for your purposes, I'll bet I'd almost rather have this 7D Mk II than a 5D Mk III.
I've been waiting for a while for the 7d2. I have a 7d and 5d3, and prefer the 7d for outdoor, well lit sports. I like the extra reach, and "feel" it tracks slightly better. I have pre-ordered a 7d2, but won't sell my 7d until it arrives. I'm very excited about the features, and hope low light performance is improved. The "anti-flicker" feature will be great for indoor sports (thinking hockey and basketball) and if it is even slightly better in low light it will be a winner. Most of all I'm excited that the price is somewhat reasonable and lower than many had anticipated!!