Like I said, my Electro didn't have as deep bass as the XK3.
Now, if you're running through a good bass amp or speaker, you may not really tell the difference. Also, with an external leslie, they both sound about the same from the midrange up, but the bass on the Electro does rollover, while it doesn't on the XK3. Tie in that to the extra drawbars, solely for bass, with the extra 11-pin port for a leslie, and the XK3 is the winner, in my book....The Electro has neither of these. To plug an Electro into a leslie, you need a converter to change the 1/4 headphone jack to a 11-pin leslie port. Needless to say, with this option, you have to use an external leslie on/off switch, instead of the one built-in the Electro.
...If you more concerned about weight, get the Electro. It's still a good organ clone. When I had the Electro, I also had the Korg CX3 (which I still have), and I like the sound from the CX3 better.
I modded my CX3 to allow me to control my Motion Sound Pro3 speaker, which simulates a leslie better than the built-in simulator, using the onboard leslie on/off switch. With an additional modification, I can plug a leslie straight in....but I'll eventually sell it and get an XK3.