Additionally both tablets will have a micro-SD slot, and a 2GB micro-SD flash memory card, upgradeable to 32GB. The Aakash is designed to support various document (DOC, DOCX, PPT, PPTX, XLS, XLSX, ODT, ODP,PDF), image (PNG, JPG, BMP and GIF), audio (MP3, AAC, AC3, WAV, WMA) and video (MPEG2, MPEG4, AVI, FLV) formats and includes an application for access to YouTube video content.
As a tablet, Newer version will also have some battery problem as big sized screen will eat more battery. So this is the main problem for older and newer version but looking at current numbers of selling of present Aakash tab (approx 14 lacs), Aakash 2 may be more popular.
If you want tablet experience only for few boring months then only buy Aakash tablets otherwise select the best in class.