If you mean an electric system with one battery, I agree the price is pretty close. But to fly all day, you need 3 batteries and a double charger. It's a valid argument that battery costs are offset by the price of glow fuel, but batteries themselves are a consumable.
Competition is where you really find out what's best. Electric has been tried in both IMAC and SPA along with F3A aerobatics. SPA and IMAC planes can't make it through the maneuvers with adequate power without paying a weight penalty for more capacity. Batteries will have to get a little bit better before electric can truly replace glow. F3A has really found all the benefits of electric and has actually started rewriting the sequences to require less power at the end, much to the chagrin of glow pilots who had that advantage for a while.