Speaker to speaker without subs, the Kantas might be more pleasing because of the bass response. However, the Sopra's will be more accurate. When you add dual subs, then the magic begins with the Sopras (assuming everything is dialed in).
Since your likes are 90s pop, I would think that the subs would add some "pop" to the presentation. I'm not sure if you have auditioned a system with subs integrated properly, but it can be a jaw-dropping experience when the subs are turned off/on.
It also comes down to budget; the Kantas may be a better bargain because of the frequency response; however, in time, the upgrade bug might kick in for a little more accuracy (for jazz and classical), which the Sopras would provide from the start.
Interestingly enough, I have a pair of KEF Reference 1 Metas powered by a pair of McIntosh MC611s. The bass response I get out of these little guys could fool someone that I have a sub. My prior amp was a Luxman 590AXII. The KEFs ate up that integrated because of their difficulty to drive. I had absolutely no bass whatsoever, and this was confirmed as a horrible match by a dealer of both. The McIntosh integrated with the Sopras will surprise you. That would be a good place to start, then add the subs!