i will say go for the acer. now remember that i said in the first post: (that is if the RAM speed and CPU architecture is the same)
the architecture in those CPU's are not the same. the acer has a sandy bridge i3 (also called second gen i3) the tobisha has a 1'st gen i3.
the 2.1 ghz sandy bridge i3 should be kinda equal to a 2,5 Nehalem i3 (1'st gen)
an important factor for me when getting a laptop is the "look and feel". and i got to say i like the acer way more.
you get a better looking and better performing laptop by getting the acer.