Rebel TX has range 6, with slightly better health per UC.
IMP TX has range 8.
Which one is better ?
IMHO, they are both good.
If you send both against rockets, then both are junk. Well, the rebel version may die faster but really, who cares.
In real PVP, in general, you would see more bursts on IMP bases and more rockets on rebel bases. This is the key point.
When playing as IMP, I‘d use jumps (range 7) to screen for TXs (range 8) against rockets. Jumps can sustain better against rockets and with shorter range, it can actually help in clearing out buildings and let TXs take out the turrets from behind. Now, if facing rebel bases full of bursts, then I send in TXs first and hold back my jumps. Timing is key here.
When playing as rebel, and against rows of IMP bursts, I’d send TXs first and with range 6, it can soak in bursts laser while allowing my jets (range 7) to do further damage. Similarly if going against IMP rocket farm, which is very rare, then I have to hold back my TXs and send in jets first.
Key point here: You can use stats for comparison, true. But IMHO, it’s better to learn the stats to exploit the units to their max potential, based on unit AI, base on oppenent base layout, and also other troops in load.