Abolfaz, I had a Murcielago and it would be very hard to say which felt faster, I think the GT is at least as fast and, as you say, is easier to drive - the engine is less stressed for a start.
The Murcielago may be quicker in the corners given its AWD and traction control, it's also stiffer, the GT has more body roll. It felt that you could push the Murcielago a little harder in the corners as the grip was so good. I have not pushed the GT as hard, so I'm not sure I'm totally qualified to compare handling just yet. I do know that the GT wallows a bit on high speed corners - it's not unsettled at all, but you can feel it.
I liked the Murcielago a lot, but if I'm honest, I always felt a bit of an idiot driving it - it was so 'loud' looking, although beautiful. The GT is a car you can get out of with some pride, it has a real heritage to it's look, one that resonates with everyone.
The Murcielago was 'snappy' quick (if you know what I mean), quite fierce, the GT feels more like the hand of God pressing you along and you feel that you'll never run out of power. Much smoother. The GT gearbox is, basically, car pornograhpy of the highest order - just wonderful.
They are roughly the same price in the UK and I'd go for the GT every time, it feels better built too.