VME64 vs PCI Bus for vibrating environment
PCI bus isn’t designed for rugged environment applications. Its mounting and edge-finger systems are generally not robust enough for high shock-and-vibe.

VME64 is better in this regard having been designed for industrial applications from the start. It has that robust DIN 41642 connector and supports hot-swap.

CompactPCI borrows similar rugged DIN connectors and mounting from VME. It may also be a good choice, it’s gaining popularity in certain markets like telecom.

That said, you have yet another choice to consider: PCIe/104, which is an evolution of the PCI/104 standard for industrial single-board computers. It uses a modular, stackable approach rather than a backplane like VME and CompactPCI.