For fingerpicking a relatively wide neck, at least 45 mm at the nut, is recommended. I know experts can fingerpick a mandolin, but for starters a wide neck is advisable. Those two guitars you mentioned are like comparing apples with pears, one is semi hollow and the other is hollow. If however you are happy with a 43 mm neck, then go for the Ibanez, they are a solid, well made guitar, and you are not paying for the Gretsch image, and anyway, they are both made in China or someplace out there. On the Gretsch website there is no mention of neck width, but it is probbably about 42/43 mm.
The Ibanez-AGS-73 is a great guitar, not many around, so it didn't make the standard range but google for it, maybe you are lucky. Cheap too.


Chris