If you're printing then print a Pantone chart and use that. What comes out of the printer is the truth. If you're going for cut vinyl, use the vinyl manufacturer's swatch folder. Pantone is for clients to tell you a number that they want, not for you to try to match the client's colors.
The operator before me used a Pantone chart he printed to pick colors and match to other customers pantones - they never profiled the printer so it wasn't terribly accurate... Everything was a few pantones off in terms of shades.
Then our printer breaks and we get a new one - now all of a sudden 3 years of files, as well as work orders were written up with the wrong Pantone since it was "what the printer thought the Pantone was" and not the real Pantone.
Now we do a small test print and if it's not a match, we find the match and input it into onyx to use those values for that Pantone. Now when the client comes back, or we dignup an old work order... It has the correct values on it. And if our printer breaks, or we print it on one of our 4 other printers... We know what to match it too.
We still have a Pantone chart printed out once in awhile because it aids in the above, and for one off customers who want to pick a pretty color it works good enough.
But I suggest everyone who can profiles their machine... And then properly sets up their rip to use the right global colors. Much more consistent that way!