I think empire would win with 95% losses, due to the empire's better sublight maneuverability and possibly scorched earth tactics (blow up asteroid fields) preventing though this would deprieve the empire of resources after the war.
My avatar is a screenshot I made of one of these (damn can't post pics from HD)
The stats (edited for clarity, edits/comments in brackets) from HW shipyards (not official, but can't find them anywhere else) are:
Statistics
Class: Fighter
Cost: 300 RUs
Build Time: 25 s
Support Req.: 5 SUs
Maneuverability: very high
Acceleration: 1,000 m/s^2
Max Velocity: 900 m/s
Hit Points: 1,000
Repair Rate: -
Sight Radius: 9,000 m
Firepower: ?
Coverage: ?
Mass: 5 q[tons?]
EMP Stun: 1.5 s[stun time if hit by EMP]
Leech Dam.: -
Salvage Points: 0
Repair Droids: 0
Nav Lights: 0
Leech Points: 0
Required Tech:
None
Upgrade Tech:
None
.
.
.
Weapons: 2 Small Ion Cannon
Mult.: 9.0
Damage:?? [~2 GT(upper limit) , based on calcs by Sir Nitram on standard ion cannons on asteroids. Still pretty good for a fighter]
Range: 6,000m [range of Ion Cannons]
Fire Time: 1.0 s