I would use the Transwarp drive. Why? Because the Federation now has Seven of Nine...If anybody can make it work, she can...but why stop there...why not do both...?
Because then you have two extra engines on your ship, and drive systems eat up space and power.
Also, "A" transwarp drive, not "the" transwarp drive. There isn't just one way to go supersonic, there isn't just one way to go hypersonic.