Linux or Windows? Which one of altera's software is more stable?

I use all possible combinations;

- Windows XP

- Windows 7

- Linux (Centos 6.4)

- Quartus Subscription Edition

- Quartus Web Edition

- Modelsim Altera Starter Edition

- Modelsim-SE (direct from Mentor)

I install the latest versions of tools (or one version behind latest) on my development machine (dual boot Windows + Linux), and have the other versions installed in VirtualBox Virtual machines. I only install one tool per VM so that I can be sure there is no problems with tool versions affecting each other. From a Linux or Windows XP host, the VM can acquire the USB-Blaster from the host, and all the JTAG-based tools work fine.

I'd consider them all to be "fairly" stable. I can make Quartus crash, but usually its when I have combinations of SignalTap II, the programmer, and system console running simultaneously. The tools play a lot nicer together since about 12.1sp1.

Cheers,

Dave