Compare UMI XE vs Micromax A72 Canvas Viva

UMI launched it's new mobile handset which is offered with a huge screen size of 5 inches i want to know that recently micromax has also launched it's huge display device named micromax A72 Canvas Viva in the market, which one is better among these two. If anyone knows then please let me know it officially as i am looking ot buy it and experience the huge display screen size mobile handset.

Both the handset are somehow the same in specifications but the micromax Viva runs on outdated Android 2.3.6 Gingerbread operating system whereas the umi xe comes with the android ice cream sandwich operating system. Micromax Viva can't be updated to Ice Cream due to low ram support.