Piledriver is very competitive with ivy bridge, performance wise, up to about $200. After that, intel dominates the high end.
To make it really simple, under $200, intel is the stronger gaming chip, AMD the stronger chip for non-game applications. Intel uses less power, but AMD give your more performance at the same price point.
Over $200, intel is the only game in town. AMD doesn't have a chip with an MSRP past that point.
As for socket compatibility, Intel has already announced that it will abandon socket 1155 with their next generation chip, Haswell. AMD has not made an official announcement on the future of socket AM3+. But given their history, it is expected that AM3+ will be used for steamroller, their next generation chip.