I'd not compare the 911 with the 900 and would have either of the same vintage with no problems (late 80s). One, however, would not feel like it were trying to kill me at every wet roundabout and so could be driven with more confidence in the wet. The other, that said, will be able to put more power down to the road.
I think it was Dad's 1972 99 GL. Or it was my uncle's 99 Turbo. Or it was a neighbour's 900 Turbo. Any way, it took a few years ;-) for me to get my own. And I had to decide that it was a good fit to my need, rather than buy it because we'd owned them in the past.
I appreciate the fact that my C9-3 and current 9-3 SS have been forgettable when I need them to be; long trips melt away. That's a combination of being easy and pleasant to drive, having decent seats and a driving position, being quiet enough. The 9-3 SS is quieter than the C9-3 TiD by a long shot but otherwise isn't more comfortable for one up, although it's a much wider cabin, so Charlie appreciates her own space.