What do you think is best glide speed Sean?
I would imagine that would be C/L max. Which is also going to be Vx.
Only in an engine with a powerplant that delivers constant thrust with changing airspeed. A C172 doesn't quite fit that description, unless you have the turbojet STC.
In practice, the difference in climb angle between Vx and Vy in a C172 is likely to be marginal. The likelihood of that making the difference between reaching the runway or not after a turnback is tiny. I suspect that the optimal policy for long-term safety management in an aeroplane you own is to climb at a speed that keeps your engine running at a moderate temperature, even if that's a little more than Vy