Terminal emulation

I’ve been asked to set up a terminal emulation system for my workplace. It’s not something I’ve ever used before and to be honest I’m at a total loss.
I’ve found these two . . . www.rocketsoftware.com and http://www1.flynetviewer.com/ . . . but I can’t really seem to find any benefit or detriment to either? Which is better than the other and why? And are there any others out there that I’ve missed?