I’m a huge fan of oval and emerald stones. (My engagement ring has an oval). And I love the look of the band on the emerald ring. It’s more feminine and lux IMHO. So pretty!
What I’m not crazy about is halos. As someone else mentioned they just look like someone couldn’t afford the diamond they wanted so, they halo’ed to make it bigger. I know this isn’t necessarily the case. It’s just an impression that many of us get. And, halos are e-ver-y-where. I fear that in 5-7 years, the style will look dated.
Is there a third option of the emerald with the same band / no halo or the round with the pretty band?
If you can’t choose, perhaps you may not have found “your” ring? Maybe keep looking til you find the perfect one that makes your heart stop? I see both of these are Tiffany’s. Perhaps broaden your search to other jewelers? Good luck!