I nearly always prefer watching the original film and not remakes. Yet somehow, I have managed to watch both remakes ("The Man Who Talked Too Much" and "Illegal") without yet seeing the first film ("The Mouthpiece")--so I can't really compare the remakes with the original. But, in nearly every case, I do prefer original films and I must knock a point off "The Man Who Talked Too Much" for being a remake.
Of the three leads from these three films, George Brent in "The Man Who Talked Too Much" is probably the most poorly cast. While a fine actor, it is harder to imagine him playing a rather crooked individual--whereas Warren William and Edward G. Robinson are a bit more at home with such roles. Also, I will admit it up front that the plot is really hard to believe. So, to enjoy the film you just have to accept that Brent could be bad and the rest of the plot. If you can't, the film just won't work very well.
The film begins with Brent playing a prosecuting attorney, Stephen Forbes. He convicts a man for murder and is quite pleased with himself--until they learn he was innocent. To make things worse (and HIGHLY contrived), they find out only seconds before the execution and they cannot reach the warden in time to stop it! Forbes is horrified and quits his job--which isn't too surprising. Now in private practice, he has a hard time making ends meet. But, when mobsters find out how talented he is, he immediately becomes a success--to the horror of his younger and very idealistic brother. What follows is amazingly contrived (you just have to see it) but also enjoyable in a brainless sort of way. Not a bad film--but one that could have been better.
UPDATE: I finally got to see the original version, "The Mouthpiece". It's significantly better...and a lot racier!