Honestly don't have an issue with either one, neither give me any problems when playing. I do like Discords chat feature better than TS, haven't really been on enough to really dive deeper into the features. TS seems to be basic and that's fine too. I had both running and TS would use up to 10% of the CPU when actions were performed and would idle around 2% when not in use. Discord would idle around 0% and go up to 4% when in use. So yes, Discord seems to use lower system resources for me. One thing I have noticed, once I've installed Discord, my screensaver doesn't seem to work, so not sure if it has disabled it, or it's just coincidence.
Question, what would if any, cost savings would this be for the group?