If you don't play games, 4736Z may be slightly faster. If you play games, 4530 will be almost 2x faster. All credits go to the Nvidia 9100M chip. I'm sorry but Intel graphics on the 4736 just sucks some serious balls. But as far as battery life goes, 4736 should last quite a bit longer. I think both sets should be just as hot, with 4736 a little cooler. At idle time though, the AMD set should be slightly cooler.