By 'no GPU' , if you meant your relying on the integrated graphics power of the chips, then the A10 wins massively hands down - there's not even a competition. Plus there's the advantage of an unlocked multiplier, in case you plan to OC later to increase performance.
On the other hand, if you meant that you're gonna buy a discrete GPU, then the i3 makes much more sense, especially with its low power draw.
As far as socket life is concerned, the AMD FM2 will be supported for another generation; the Intel LGA 1155 socket is soon reaching its end, but you could always upgrade to a powerful 2nd hand i5 or i7 for cheap later down the road
All the best with your decision