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I own the 5D3 and the 7D2 and the AF systems are essentially the same, so that should not be a factor in you decision. You don't describe a usage that requires 10-fps, so I would not let that hang you up. The 5D3 is plenty responsive and I've even used it for bird-in-flight with success.
Both are a huge step up from your 7D in terms of high-ISO performance. Where the 7D started getting sketchy at ISO 800, particularly if you under-exposed, the 7D2 is now solid up to ISO 1600. The 5D3 is better still, but not a full-stop better.
Your lens kit is set up for crop sensor, unless you're really Jonesing for something like the EF 14mm f/2.8L II which would be a waste if not matched with a full-frame body. Based on inertia, I'd say stay with the crop-sensor.
Your 7D sensor is several generations old now and there's been huge improvement since we both bought ours. Scrap it.
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