WW will be quite a bit more profitable than Suicide Squad on the strength of costing an estimated $25 million less to produce/market and having already made $66 million more domestically.
Since film production companies keep a good bit more of the domestic gross than international (we're talking anywhere from 55-90% depending on the film, studio, theater chain, week of release, etc vs 15%), domestic gross is much more important dollar for dollar.
Merchandising and licensing-wise, I can also picture Wonder Woman coming out ahead. Sure, Hot Topic was loaded with Suicide Squad tchotchkes, but WW is a more established character with more mainstream appeal.