Working moms commonly testify that they feel guilty when they are away from their children and guilty when they are not at their jobs. Devoted fathers certainly miss their children deeply but it does not seem to be with the same gnawing primal anxiety that often afflicts women.
The best situation is being a single parent. The best part about is that you get time off too because the kids are with their mom so it's the best of both worlds. There's a lot to be said for it.