I think a bit of perspective is needed here...

As a low time pilot, ANY experience with larger aircraft (even if it's only level D sim time) will add to your resume.

What you need to ask yourself is WHAT DO I WANT TO DO WITH MY CAREER? If your ultimate goal is to fly for the airlines, I'd say keep working in a job that allows you to build actual flight time, even if it's in a 172. Get your TT up, apply to a regional and fly the line.

That said, if you want to fly corporate or charter, you're probably better off doing one of these right seat gigs. I believe that FSI has a similar program, but they actually pay some of their folks to do the same thing.

The networking you can do as a seat-sub in a simulator is pretty incredible, especially if you conduct yourself in a professional manner. You can also learn a LOT from seeing people from a wide variety of operators and experience.

Today's modern sims are very impressive. The last event I did was my CL604 type at FSI Tucson. They had just upgraded the visuals... even after over 250 of "flight time" in sims, the realism blew my mind. Blowing sand and snow, radio towers on the visuals that had strobe lights and proper markings/paint (and even guy wires!). That said, sim time isn't going to subsititute for actual experience.