I Think Lava should comes in the series of good smartphone. because its launched quadcore processor mobile phone & also going to launch latest features of mobile phone..
MORE TIME ON THE ROAD, WAY MORE. Unsurpassed battery life and Android 4.1 make the P770 the first choice for professionals 4.5" IPS display and Android 4.1 Jellybean OS 1.2GHz dual core processor for fluid multitasking Dual sim, dual cameras, FM radio, GPS, microSD card slot up to 32GB Up to 16 hours 3G talk time and 300 hours standby from a 3500mAH battery
The battery lasts only 8 hours with all the applications being kept closed. If chrged full at night 8 PM. It will have only 50% chrge at 6 amm in the morning. You will have to carry an extra battery to carry and use this phone for more than 10 hours a day.
Battery doesnt last more than 12 hours in Galaxy Grand - Time taken for charging is also very high. Plus various other problems like "audio failing" - Not a good option