Why?
Well, let's look at it.
First off, the Orion IIC can carry much, much more than its IS counterpart. It can also use a Clan XL, which is a huge advantage even with the penalties.
One problem I see, though, is the quirking here for the IS Orion.
Now let's compare the two builds I've prepared, the Orion IIC Lighter Atlas build, and the Orion Mini Atlas Build:
Orion IIC
Orion IS(M Variant was the closest I could get to the IIC verison)
So the IIC gets more Damage and Speed (Thanks for reminder Gas Guzzler), while the IS gets, well, a slower engine and a STD. Here's where the quirkening comes in.
ORION QUIRKS:
They look fair, right?
Well, sort of. The weapon quirks and others are fine, but what gets me are the Structure quirks. These were implemented when the Skill Tree was knocked down a bit so that mechs could be more survivable.
Yet, the Clan mechs got a few, if not any, quirks to complement this. Even before this, IS mechs had Structure quirks, and now they've been beefed up even more.
What I'm getting at is that IS mechs have the armor to take damage but don't have the weapons to do the best damage, while the Clans have the weapons to do damage but do not have the armor to sustain it.
And this problem is going to keep staying this way unless new tech is implemented, such as the other IS Ultra Autocannons, and the clans Heavy Lasers, or even the IS X-Pulse Lasers.
At least this is what I see in my eyes. If PGI can gives us some new tech I'm more than happy with the game than what's already coming.
EDIT: Orion IIC has another advantage against the IS counterpart when no quirks are involved.
Edited by Scout Derek, 12 January 2016 - 10:02 AM.