I'm thinking between soldier and spy because they come up in GW store.
Sun Fac also shows up in the galactic war store.
But, really, with Geonosians go either all or none. You're getting them largely for their uniques, which get better with more Geonosians in your lineup. You'll eventually want all three anyway, so start now--the sooner started, the sooner finished, and the longer you can profit from them.
Without other geos sun fac is still a very good tank to run in a TW fleet and even in ur main arena just as biggs replacement+double sun as reinforcement... Since they all can be farmed in GW store i wiuld say sun fac for sure xD
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Sun Fac also shows up in the galactic war store.
But, really, with Geonosians go either all or none. You're getting them largely for their uniques, which get better with more Geonosians in your lineup. You'll eventually want all three anyway, so start now--the sooner started, the sooner finished, and the longer you can profit from them.