Headcrabs are inevitable, yes. The canister launcher is nice as a way to mess with the enemy once hostilities are fully opened up, just not what we're aiming for right now.
We're aiming for
crab synths, not headcrabs.
They've got gatling guns, might have potential for a secondary from the look of said gun and look like they trundle along being super tanky. Which is what we need, something to take the hits during a fight and act as a main pusher our other forces cover behind and around.
With at least one we can do an offense on a harder target since we'd have something to take the hits of turrets while our troops maneuver around providing support. The Hutt troops would need a rocket launcher equivalent and multiple hits hopefully to really take one on.
Repulsorlift probably takes more maintenance and there are likely planets where the local atmosphere interferes with the stuff.
But more to the point, there exists anti-repulsorlift technology. Specifically
jammers that ground the vehicles.
We'll want a mix of vehicles for various conditions. And with roads active, wheeled vehicles can probably carry more loads more efficiently.
However, with local conditions, specifically plant filled and swampy, I feel that hovering is the way to go for our immediate transportation concerns, for things that can't
walk through the swamp like our crab synths.
We'll want to defoliate and make roads to the rest of the planet in time, so we can make rails along them, which will be useful for our upkeep I believe, but that's a concern that's not immediate.