Iconia one 7 is the cheapest among the two, various colors would be available the major colors are Black, White, Red, Blue, Pink.
7 Inch LED Backlit IPS Display it have 800 x 1280 pixels, dual core 1.6GHZ Processor speed, Intel Atom Z2560 Processor with 1GB Memory, MICROSD Card support, Battery Backup is 7 Hours, 5MP rear camera on the back, secondary camera on front.
The tablet has 4.2 Jelly Bean right now and Acer will update it to kitkat at some point. The availability of it Iconia one 7 will be first available starting Mid-May in Europe, Middle East and Africa.
It will cost you 139 Euro as standard price, Slate model will be launched in North America, Central America, South America at the end of the June and standard price for it will be 129.99$ as Basic Price.