MMD:
Now that I think of it, "There Is No Substitute" isn't exactly a nice slippery expression that slips off the tongue and goes right to the brain.
"Substitute" is an awkward word to say, it rhymes with prostitute, tits, and utes! "Sub" isn't exactly a dominant word either.
I always thought it was a translation from the German, thus accounting for it sounding slightly off. Now it seems to be typically Porsche, excellent in all other ways but slightly off in the marketing and aesthetics department. It's kinda like the SC wart, quads and lobster fork wheels: evidence of just-below-excellent "styling."
How about, "Porsche, There is No Alternative." No equivalent. No parallel. No equal.
"Substitute" as a word with meaning isn't exactly "commanding" it is a weak word, hard to say and not exactly positive.
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2007 997 Turbo
that's why i love it. It has a certain politeness to it. IMO if you claim there are no alternatives it's kind of rude because well there are. One could chose alternatives these days, especially regarding the turbo, but would those alternatives really substitute what the TT could do? No, because it's rear engine, front trunk, 2 door with space in the back layout is quite unique.
I think the no substitute works nicely because it implies a certain politeness to the sense, that of which Porsche is known. They are by all means not flashy or out there getting everyones attention like Ferrari/Lambos would.
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2005 Ford Focus S, 5spd
1986 Porsche 944, 5spd