In an area where I would not expect rust to be a problem, I would choose either model but based on the overall condition of the car. Of course the 123 is newer so there will be some things which are better because of the newer design, but mostly they are very very similar mechanically.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.