The only hardware difference between the Samsung Galaxy Pop S5570 and the LG Optimus One P500 budget Android phones is that the Optimus One has a larger 320×480 (HVGA) display, while the Pop has a 240×320 (QVGA) display. This, by itself, makes the Optimus One a better choice between the two, justifying the slightly higher price (Rs. 9,350 vs. Rs. 10,300).
The other notable difference is that the Optimus One is expected to get the Android 2.3 Gingerbread update. The Galaxy Pop, also known as the Galaxy Mini elsewhere, is most likely stuck with 2.2 Froyo.
I personally do not like LG mobile phones, but I recommend the Optimus One because it isn’t a device you will be holding on to for a very long time. It’s good enough to serve as an extended tour of the Android ecosystem, after which you should upgrade to a more capable device, such as the Samsung Galaxy SL (Rs. 19,900).