In recent years, the term "inverted dome" has been used in place of "dish". While it may IMPLY a chamber-shaped dish, it isn't always "so". But hey, it sure sounds a lot cooler than "dish", don't you think? So do piston makers...
Knowing what engine these pistons fit would be a big help in telling you whether or not they're "good" for your application. If you're not "pressing the edge" of compression for the octane used, the "simple" dish is fine. The quench pads come into serious "play" when you're near the limit.