Borgs versus Lizards

Several issues can be taken into account.

Neither ship has an Evasive Bonus or an Attack Bonus, so the basic
weapon stats become very important.

The T-Rex has minimal shields, so Shield Drain isn't very important.
With massive armor that only takes 1/3 normal Armor Drain, Armor Drain
is hugely important. A couple of Ion Cannons *might* be considered, as
they can start damaging the Systems before you have halfway chewed
through the armor.

The T-Rex has only 5 PD slots, and the Cube has 20 LWeapon slots, so
PDodds may be less of a factor. You might consider overwhelming him
with Photon Torpedos. If you have more than 10 Torpedos, more than
half will be hitting (up to 75% if all 20 slots are Torpedos).

The T-Rex can mount TLAs. See if he has any Amphibians in his bases.
If he has them, its a good bet that he will use at least a couple on
each T-Rex (he could have up to 4-5 or so before running out of energy
to power any other weapons). If he has them, you may need to go with
Gatling Phasors to match his firing rate (or just see if Standoff Range
is working).

If you can afford them, go with Intercepts for PD. They can block 2/3
of his LWeapon fire, which may offset his 1/3 Armor Drain quite nicely.

Of course, if you go loaded for Bear (the T-Rex), beware getting
swarmed by the Coyotes (Lokis) and Mosquitoes (Fighters).