If the cost was the same, then maybe kegs. The price difference between a kegging system and BC is usually quite a bit.
If you get a BC you can save LOTS by buying bulk, but only if you brew a lot. Keggin is nice, but more nice if you drink lots. I have a 2 tap system and can't drink it fast enough, so I end up bottling some. If I had beer guzzling friends, then the Keezer route would be the way to go.
I got a fridge from Wife and put together a kegerator. I built my own barley crusher at work with the CNC Mill and lathe, so the cost was really free. Second one I had to buy my own bushings... $10.
Going from extract to bulk AG is saving me close to 50% in ingredients cost.