Spoiler: There is no ‘winner’ here.
Your yo-yo of choice is about trade offs. Size, weight, and material are factors in a yoyo that you cannot change (generally speaking). Your choice of bearing, however, is a variable. There are many types of bearings; steel, spec, ceramic, center trac, concave, the list goes on. Those all have their own traits and marketing behind them, but what I want to focus on are physically different bearings, Flat vs. Curved.
Most yo-yos come with a stock flat bearing, the quality of these will vary greatly by manufacturer, but the general properties of a flat bearing are that they tend to be more responsive than the curved bearing. The likely hood of a (quality) large bearing yoyo snapping at your knuckles is fairly low, so ‘responsive’ takes on a slightly morphed definition. When I talk about response with unresponsive yo-yos, I am referring to how well the yoyo binds at low RPMs.
Flat bearings, in general, are better at binding at low RPMs than the curved bearing. I feel more comfortable trying out a flying regeneration on my Spec Bearing than I do on a Center Trac, at low RPM. The bottom of the string loop slides along the bearing and rubs against the walls of the yoyo creating friction. That little extra friction helps the yoyo come up tighter when it’s time.
If you aren’t into regenerations, maybe a curved bearing is better for you. There are various ones on the market and while some are better than others, they all share the property of increased spin time. The way these bearings work is they bring the string toward the center of the gap, minimizing friction. That leads to longer spin time but sacrifices some responsiveness.
You might see an immediate benefit to the curved bearing if you want to milk the yoyo for all of it’s spin. If you want to perform trick binds or regenerations, I’ve found that you may have to sacrifice spin time before you’ve actually gained any, meaning you’ll have to cut your combo a little short because you need more RPM to have greater success performing a trick bind or a regeneration.
I’m not saying flying regeneration tricks aren’t impossible on curved bearings, nor am I saying that you can’t perform long combos on flat bearings. We are at a point in yoyo design where you can do any trick with just about any quality yoyo; so the variable differences we do have, like bearing choice, are more about tastes and style than functionality. There are plenty of top players who can land consistent regenerations on curved bearings and players who can land one minute combos on flat bearings.
It’s difficult to talk about variable properties in the level of response in an unresponsive yoyo, when it’s never just one variable at work. All examples above are assuming you use stock pads and stock string, but even those differ manufacturer to manufacturer. To look into the level of bind response in any yoyo, you also have to take into consideration string and response system. Those variables, however, are for a different time.