I thought this was interesting. The dilemma all of us in O gauage have is that very few 1:48th scale vehicles are available. Most are in 1:43 (10% too large) and a few trucks and construction equipment in 1:50th (4% too small for 1:48th scale).
Here is the exact same piece in both scales:
Left: Diecast metal cab from a Corgi 1:50th scale model of a 1953 Mack tractor trailer
Right: Diecast metal cab from a New Ray 1:43 scale model of a 1953 Mack tractor trailer
Quite a constrast. When given the option, I generally go with 1/43 for the smaller cars and such and 1/50th for big things like Peterbilt tractor trailers trailers, etc.
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