Will an E-fan cool better? It depends.
On my 65 it was a challenge to find an electric fan to fit with enough CFM to keep it cool. I went with a Flexalite trimline 116 and an alum rad. This combo works well.
I think you have a lot more room between the rad and the water pump in the 69. So you could use the Flexalite Black Magic which would work very well IMO.
The one thing I like about the Efan is how smooth my engine runs compared to the flex fan I had before.