Windows 98 was awful
I only care about compatibility. So far Win98 is the only one that allowed me to play games that were new releases (at the time) and also restart in pure DOS to enjoy good old titles.
I also know that we all have different experiences with OSs but 98 SE never crashed on me without a reason. I love it... If developers/publishers are going to come up with Vista-only products it would most certainly make me buy VirtualPC this time...