Hello Mark,
IE driver is a bit of problem as it do crash often on a VM. So surely not suitable for running tests in CI (continuous integration).
We tried MS EDGE, but can't make it run any behat scenario. It crashes after invoking, so surely need to wait till MS fully supports it https://dev.windows.com/en-us/microsoft-edge/platform/status/webdriver/details/
FYI:
- 32 bit driver is more faster then it's counter part 64 bit.
- There are few known failures on IE.
- ATTO adds different style params when using IE
- Switch window fails
Hope this information helps.