Canopusener is the green mechdragon :V
Regulus Reggy is the Light one.
Yeah. Right. That one. Shows how much I use 'em. :V
But yeah, kinda wish the other colors would get ults too. They're nice stat sticks!
I could do some number crunching depending on how hard the actual math is, I just need to know what exactly we're comparing here. Entire teams would be preferable since we're talking about orb enhance awakenings.
Well overall I suppose the contenders here regarding dragons are (noting that PDX does not have Awilda's LS correct, leaving out the 1.2x all stat boosts for dragon):

Full team HP (assuming hypermax, correcting for what PDX leaves out): 38950
Full team Water ATK (same): 117,474
Full team RCV (same as above): 4081
In this layout, we have 13 water boosts, and that therefore shall assume that you'd be seeing a 65% boost in damage. The problem is, I don't know how enhanced orbs are calculated into damage totals. Zaerog's place, of course, would double all damage for a turn as well as do a 15% gravity.
Technically I suppose one could drop Orochi for a water enhancer and that would give maximum effect, but my counterpoint is that you get *4* free turns to beat on things with his active (also note that Awoken Orochi can hit REALLY REALLY HARD with 4 TPA).
For the sake of enhancers, Zaerog or Orochi could be dropped for... well, Aldebaran is the best (rather, ONLY) dragon option. Which isn't necessarily a bad thing, but his enhancement would come at the price of losing two very useful actives:
If Zaerog is dropped:

Fixed Max HP: 40555
Fixed Water ATK: 116073
Fixed RCV: 4458
One more orb enhance, boosting the bonus to 70%, better HP, better RCV (because lol Zaerog HP). Water ATK is negligibly lower, though Aldebaran lacks Zaerog's TPA. He does pack the orb enhance active though.
If Orochi is dropped:

Fixed Max HP: 38312
Fixed Water ATK: 122553 (but at the price of losing Orochi's 4 TPA!)
Fixed Max RCV: 3879
This one I'm quite a bit opposed to. Worst stats of the set when taking Orochi's TPAs into account, and there's little benefit to this team that replacing Zaerog did not have. 14 enhancement awakenings still. But no quad-TPA and no 4-turn delay to beat things until they die.
Thus, unless Aldebaran's enhancement is really that fantastic numbers-wise compared to losing Orochi, I think it would be safe to conclude that Orochi should stay and Zaerog's position is the tenuous one. But at the same time, does a 2x burst and a gravity not outweigh enhanced orbs, and at what threshold is one better than the other?
One more possibility, if one were to consider ignoring the stat boosts and putting what should seem to be the ideal non-dragon enhancer, BOdin, in Zaerog's place, stat calculations noting BOdin's less-boosted stats:

Fixed Max HP: 32869 for the dragons' enhanced HP plus BOdin's unenhanced 5521 HP =
38390Fixed Water ATK: 97479 for the dragons' 9x, plus BOdin's 11163 at 6.25x =
108642Fixed Max RCV: 3869 for the dragons' enhanced RCV plus BOdin's unenhanced 845 RCV =
4714Surprisingly, this still has comparable HP due to BOdin being absolutely massive. The ATK is understandably lower, but this is supplemented somewhat by BOdin's 3 TPA, which should keep him hitting hard. And this set has the best RCV overall. However, this is at the price of a great 2x burst from Zaerog. However, this setup also works strongly in favor despite that, since BOdin packs three skill boosts to get Orochi closer to usability, and his active can save you if your HP gets hit below 50% (don't forget that the ATK boost is lost under that HP threshold). His three row awakenings can allow flexibility as well, allowing you to punch hard individually with TPAs or boost everyone by yet another 60% for each row you make. This one seems like the clear-cut winner, honestly.
The catch to all of this remains, however: I don't know how enhanced orb damage is calculated. So I'm still not entirely sure if it beats a 2x boost/gravity (which, keep in mind, can do a lot of damage in and of itself). Otherwise it looks like the lattermost build is the winner.
What do you think?