Funnily enough, I'm doing a PhD along the lines of this topic. As part of my research, I'm involved with a team developing hybrid powertrain for a certain automotive group based in the West Midlands
Having driven a prototype Smart Fortwo Electric, a prototype Mini-E, Nissan Leaf, Mitsubishi iMiev, Prius, Insight, and the FCX Clarity, my vote goes to electric cars just for driveability alone. By having maximum torque from zero RPM meant that the Smart out-accelerated many turbo-diesels up to 30mph. And because all of its weighty battery cells were sandwiched inside the floorpan, it handled ridiculously well too.
But for everyday use, I'm afraid its still hybrids for now, of which the Prius gets my vote. Its powertrain is still the industry benchmark and the hybrid synergy drive is simply a work of art (to me at least! )