BMW E36 M3 or Audi B5 S4 - which way would you lean?

[V8Wagon]

I'm after some rapid yet hopefully reliable transport and am dithering between a tidy E36 M3 or the S4 Audi. I know they are different in many ways but the performance is pretty similar.

Anyone got any views on why one would be preferable over the other (bodyshape aside, as I could go saloon, coupe or estate tbh)