Again, the XG-1 and the lambda have little in common, other than the manufacturer.
Perhaps, in this miniature game, both would have a cannon slot. But it would be for entirely different reasons. In the lore, the XG-1 had ion canons, so it needs the slot (or some other way to equip ionizing weapons). The lambda had lots of frontal laser weapons, so they chose to represent that with a cannon slot where you can equip the mangler or the heavy laser cannon.
Other than that, those two ships are totally different. The XG-1 is conceptually floating between the BTL-A4 Y-Wing, the X-Wing and the B-Wing.
It is not a heavy bomber (that is what the TIE Bomber is for), but can equip missiles. It's definitely not a shuttle at all or large base ship. It's not a TIE Defender, but can ionize and take care of itself. It doesn't outmaneuver an X-Wing, but it does outmaneuver a B-Wing or a Y-Wing.
There is not a ship like this in the Empire, the closest thing could be a small-base firespray without crew or rear arc, perhaps with systems, and attack rating of 2.
At least I find it closer to that, than to the TIE Punisher (that is a bomber heavier than the TIE bomber) or the lambda (that is totally a clumsy support transport).
I agree with the criticism that it is a ship that feels closer to the Rebel modus operandi than the Empire's. That is what it is. The XG-1 was, in the lore, the first step taken by the Empire away from the Imperial doctrine of shieldless, specialized, tethered TIEs, that followed with the TIE/x1 (Advanced), TIE/x2 (Avenger), TIE/x7 (Defender) series.
I guess, in the new lore, that "first step" is the TIE/v1, even when it has basically nothing in common with the XG-1.
I thought the K-Wing was ugly until I saw the H-Wing. The K-Wing looks goofy. The H-Wing is directly ridiculous. At least the K-Wing has the decency to fill up that K-shape with stuff useful for its role. The H-Wing is a sad excuse to stick to letter-shaped ships...

