You'll get a bit more mileage and power out of the 4banger with the efan
But I know if I put one in, I'd start looking at this new space under the hood and think: "shoot, I could practically fit another 4 cylinder in there!?" Then the financial dominoes would start to fall (at least in my case): V8 swap, axles, tranny, and so on
Me, I can't afford to install an e-fan on this 4banger until I have ludicrous money to burn.
And what can you use this new space in the engine bay for? On-Board Air? Tools? It looks like everything would obstruct air flow.