"View Device Logs" option does not show all the logs in Xcode on one Mac

Question

I noticed when I develop apps using different Macs(i.e. office-Mac and home-Mac), every time I plug the iDevice(iPhone, iPod...) with Mac, click the View Device Logs button under Window -> Devices and Simulators option, there are some (crash)logs in one Mac and others in another Mac. Or sometimes

My question is:

1. why this is the case?
2. How can I view all the logs in one Mac?
3. Is there another way to view/analyze (crash) logs of iDevices correctly and conveniently without using Xcode?

Here is my environement:

• macOS: High Sierra(home-Mac), Sierra(office-Mac)
• Xcode: 9.2, 8.3.3
• iDevice: iPhone SE(iOS 10.3.3), iPod Touch 5th-Gen(iOS 8.2)

Many thanks in advance.