Depends. I find the Saw S to be amazing. I even have the standard Saw tricked out with 430 certs. The better question, run and gun or cover shooter? CqC or long range?
I always recommend trialing the weapons before buying one - if you weren't aware (I didn't know about it at first), you can try out a weapon every 8 hours for 30 minutes (though you can't trial the same weapon again for a month). It's not always enough time to get a full experience with the weapon, but you can at least see how it feels. I'd also recommend Quor's guide to get a good rundown of the capabilities of each LMG. The EM-1 is a great short range weapon due to its high RoF, while the EM6 is probably the most versatile LMG as it's good at any range, and the GD-22 is decent at mid and very good at short, but limited by a 50 clip. It's all about what you prefer in an LMG, but I really don't think you can go wrong with any of them.
