Ethernet to GPIB vs PXI to GPIB

Hi,

i am in a process of building a test system , i have a requirment to add a GPIB interface to the system.

i have nailed down to ethernet or PXI solutions for al instruments.

i find there are both ethernet and PXI option for this.

can any one please justify the advantage/disadvantage(ethernet to GPIB vs PXI to GPIB) on using one over the other.

Thanks in advance

Bharathi