Different kinds of product: one is active with its amplifier built in, the other passive and needs one. Judge them on how you want to own the system, not just the specs.
| Area | Better | Why |
|---|
| Bass | evenly matched | Much the same reach (50Hz vs 50Hz). |
| What you buy | depends | Kanto TUK is a complete system - just add a source. Kanto YU Passive 5.25-inch also needs an amplifier: more money and another box, but you choose it. |
| Connections | depends | Kanto TUK has Bluetooth and phono built in. With Kanto YU Passive 5.25-inch that all comes from the amplifier you pair it with. |
| Upgrade path | depends | Kanto YU Passive 5.25-inch can be re-amped later and outlive several amplifiers; Kanto TUK ages as one unit. |
| Size | depends | Kanto YU Passive 5.25-inch is easier to place; Kanto TUK is bigger, which usually goes with fuller bass. Your room decides. |
| Expandability | B | Kanto TUK: a sub output. |
| Price | A | Kanto YU Passive 5.25-inch is cheaper - $240 against $900, about 73% less; arguably a different class. Speakers only - an amplifier narrows that gap. |
A Kanto YU Passive 5.25-inch B Kanto TUK
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
Kanto TUK suits you if you want one box, ready to play, with nothing else to buy. Kanto YU Passive 5.25-inch suits you if you already have an amplifier, want to choose the electronics, or expect to upgrade in stages. Neither is the better speaker in the abstract. In a large or open-plan room, Kanto TUK has the cabinet volume to fill it more easily; in a small room, near a wall or at desk distance, Kanto YU Passive 5.25-inch is the easier speaker to get right. Think about the whole system, not just the speakers: the roughly $660 saved by taking the cheaper pair would buy a subwoofer or a better amplifier, and either usually does more for the sound than the difference between these two.
And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.