you're going to have to deal with wiring one way or another. get used to it.
In most cases a carb is not tuned to your specific engine and drive train configuration out of the box.
Carb is tuneable and less electronics, but the time you spend tuning the stupid thing is comparable to adapting a wiring harness. The benefit of EFI is that you just wire the shit up and it just works. Take your pick.
If you have EFI components to do the swap, then there's no point in going with a carb. Do some research on the carb you're thinking about buying. There is more to it than adjusting some screws.