The problem with the WFLY radio is that it's going to lock you into the WFLY brand -- for better or for worse.
When I reviewed their 2.4GHz RF system it was okay -- but not as good as a full-time FHSS system like the FrSky, Hitec or FASST system.
The Turnigy 9X radio is brilliant value -- but it's not a top-end, high quality radio. Never the less, for the price, it can't be beat.
If you buy a WFLY and find it's not what you want then you've wasted $316 + shipping. If you buy a 9X and find it's not what you want then you've only wasted $60 plus shipping.
The 9X can also be fitted with the FrSky 2.4GHz system which will deliver a pretty bullet-proof RF link with failsafe and the option of telemetry.
So, if you're just going to be sport-flying then the 9X should be a good deal.