When installing a device why would you prefer to use a pci expansion slot rather that an isa expansion slot?

PCI has several advantages over ISA, that make it a better choice for most devices.

1. PCI is several times faster. ISA is an 8/16-bit interface that runs on an 8 MHz bus. PCI is a 32/64 bit interface that runs on a 33 or 66 MHz bis. Thus more data is able to transfer to and from the PCI bus.

2. PCI was built with Plug 'n' Play support in mind. No special configuration is needed when you install PCI cards. When installing ISA cards, you will often have to configure jumpers on them to specify an interrupt and DMA channel, and many cards can be incompatible with each other.

3. ISA is all but absent from modern computers. One of the requirements for a computer to bear the "Made for Windows 2000" sticker was the removal of the ISA bus. So there have not been any major ISA motherboard vendors in 10 years.