You don't state the year of the 993. '95s are good cars, but don't have the varioram of the later cars. That said, '96 thru '98s have the secondary air injection problems that arise on higher mileage (50k +). The dreaded CEL comes on and you're usually looking at a top end rebuild.
I have owned and driven numerous 993s and very much enjoy them. However, they are very different cars to a Boxster. Driving them these days, they have a dated feel to them, but not nearly as much as an earlier generation Carrera. My friend has a '98 Carrera S, which is a wonderful car. However, it doesn't feel any faster than my Box S and the controls, shifter, etc, feel dated. It is also fairly heavy and does not have the same sharpness a Box has on the twisties.
They are very popular cars and the hardcore 911 guys covet them as the last of the great air cooled models. Only you can decide which you like better.
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