I agree, as far as gaming performance goes those two will perform similarly at the same clock speed.
I would not recommend anyone invest in a FX CPU in 2017, they are 7 years old and on a dead platform with no upgrade path.
If you are on a budget I would look at an 8th gen intel i3 or a Ryzen 1300x.
Also at say 1080p, you wont be playing really any new games at high settings with a 750 ti and get decent framerates, regardless of your CPU.