i think it'll be stronger than seasonic.
Don't know what you consider "stronger" since they're both 430 watt PSU's and the Seasonic is considered conservative in its measurements. The Seasonic PSU's consistently show good voltage stability under load.
The Antec PSU is certainly a good one, but as you note, it is not quiet, and the Seasonic definitely is.
I voted with my money and replaced a relatively new Antec TP380S with a Seasonic S12-430 - one of the more significant quieting and cooling improvements to my system.