I own both. Both are great. The 600 Pro flies a bit better in my opinion. It's probably my favorite heli. You may always wonder if you should have got a 700 instead, but you will not be disappointed with the 600 Pro's performance.
The only problem with the 600 Pro is the tail can blow out if you push it hard. Fortunately, larger tail blades and/or higher headspeeds will solve this issue. It's nearly a perfect balance of stability and performance in my opinion.
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