Opinions: Best map for gold solo

Looking for opinions about which map is the most "Giant" like for gold soloing. Giant was the easiest on ME3 because it had a great kiting rhythm to it. So far, I'm thinking Magma fits the bill, although I haven't tried soloing it yet. 

It depends which faction. You don't want to get trapped inside with Adhi and Berserkers, yet shelter indoors from Observers and Annointed. Objectives are a lot easier on bigger maps, so I'd say Firestorm or Icebreaker. Firestorm doesn't seem big, but the 3 floors more than compensate. Kiting on Magma is hell on wave 4, 5 and 6 vs Kett and Remnant, because the Annointed and Ascended flank so damn fast, half the map has little cover from Observers, and you can only really go 1 way. But that can work fine versus Outlaw. If you plan to use a lot of powercells I find Firestorm to have the best places for ammo, whereas visiting most boxes on IB need careful strategy if the enemies are still spawning. Of course with stealth grid you don't care, but escaping after getting ammo can be really hard on IB if you haven't memorized every ledge to jump on. Firestorm has great routes to and from boxes, so it's easier to adapt if your planned route is blocked.
But I don't have the patience for a solo, so I don't know how much value it holds